Malicious PDF — malware analysis report

Static analysis result for SHA-256 675e51947adabf04…

MALICIOUS

PDF

96.2 KB Created: 2021-08-05 07:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5ef9825e2641d43e824962abae06dc43 SHA-1: 9de8d2e05913365a54016d2950d035f40cf2535c SHA-256: 675e51947adabf04688bb24d2491a103d80c93834c6e812abf642544c499a0ea
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ketchas.ru/uplcv?utm_term=hcu+client+crack+2019+download PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/305648f8978719476b9799a62b1f04df/76526968600.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/74194870314.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/15090451613.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/puzaxedulalazinezenokor.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fosiguvavuwiso.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/idijjv9504675gn4lkqs57g7nr/puribu.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/75725124613.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2nqrip8ih1fcahjcc8vkvnsqi5/32672911887.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/25851942197.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210726_F237CDB9E2BA81D2.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f9b7e090748682b0f2f0b3f34a107a20/zewuwuxenavaritido.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/bae7e79f43bdfd3bdcc15c1865e3f13c/51702334910.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1600c97b8805efdbfa312dbab93d2752/26792545868.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021842142148643.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160853e22468d2---gejukizutogoze.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/5uqee59ns93le4fjl3qhrif5m3/tujawuvuwuwikutopulizozu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160df1231d82ee---xexib.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/90566969041.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/c95fa2f2e273a697989098804b01f1b8/fajinoxopexodofutok.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/208fe1313b053b286a8a53edfeaefba8/15259100426.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/57381357623.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1a28c2e4008b840233b70bd5e56281fe/10731434435.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e2cf26c7b---41667497762.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/fekebeviso.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/989814320.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 18236 bytes
SHA-256: 304c8d14c7649e80828df5c021ce3e085f8a72f8b3a8fb4348dabd4c5f03e5fd
font_01_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B2 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00015832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15832 10928 bytes
SHA-256: 5275d7ab7e114d6623e0caa05c40e4a0f45ec4ccc3c298dcb3a0c40d8bfa14fc

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