Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b76a132bfc2adfe…

MALICIOUS

PDF

100.0 KB Created: 2021-07-23 03:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8862e8e118d5be61a00a547a812b7586 SHA-1: b59410114ff0be22f0110b0acfb80b0bac55aeb3 SHA-256: 7b76a132bfc2adfeb173027276a2d9e3676c5794b46f262df16b4028c48c3c57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and embedded links suggest it's designed to lure users into clicking through to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/21e0f916ccce1c79eb7ded35add84ccc/gudizagunoxumevo.pdf In PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/vsu1fmi6vhu38d82jgmju1q0nl/68518505743.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9281ad04---43248304893.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/5792887397.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609084115c160---jowomibipewurutivedikam.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb08e9f46c---1350805122.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c5d54dc2f8d201455380b169d8a9367e/19025641830.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/relagowixazudur.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/072b5b60b2b8d3f8296c0bd6e3876eef/55221664188.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/02ff67b31b9c98f9500d7dc5237906cf/86605104469.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3pt4u5qcsgdtlsv9i8djdfvej0/lifexifivimuliju.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210714_ACC0E275BF1F3A09.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/439317f2093d2a9848b0c81b9bb085a2/belinosemuzi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d88c53c1a478fc9dd2700b74eba54114/selatizevezagujoragejo.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a83fd415e3f---fovukaluvojimuf.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cf8229e56ef6b1555a56edbe30e03422/bivezobobuxurug.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a46e3dab---86083737121.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb51c9aea7---50303612257.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f46b6bbf3f---xowexosujigimiguji.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/nogiwowapaleviwut.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/69938598099.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160833af49354a---69359721504.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a192f81d8f0---41598922282.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/moterebovun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=lagu+you+can+say+what+you+likePDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 10760 bytes
SHA-256: 54f76a7bf2042086520508143c7bc20420a2bd478326d9c85d050d54e56589e5
font_01_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15427 17528 bytes
SHA-256: f5ffd8186fbddde157c80f308f3d1cf40169f24eb5a56e975594ac03c0b64501

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