Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f673f9bdc8ca25…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81154da6ee4fab14a8cd5a441991fb97 SHA-1: 1b27cfbbe764e04b219b3b6c909acc88e520b693 SHA-256: 46f673f9bdc8ca253973f8f66a0a79bfc7016533bb63b2243cf1cc0954ce1f89
176 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were extracted, the presence of numerous links to PDF files hosted on various domains, many of which appear to be compromised WordPress sites, suggests a phishing or scam campaign. The embedded URLs point to potential second-stage payloads or further phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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.
  • 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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e6a6097---lipoduxojamewurapabatitip.pdf In PDF document text
    • https://aksukartela.com/images_upload/files/95260378475.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3mh61gvocl6u2v0nvaslr19l8o/vepirokigolifosegodomof.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/sisowuxosom.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/09u7ekaue6edrgnrvg215lhq0q/kamaw.pdfIn PDF document text
    • https://ivanamihic.com//files/powimesiweguzunonolax.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/h62c16pk5oam63dn0gltk2vbco/zuvegenubimivafakeliwer.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/jivifitenezev.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e09a3dbd3---97927240023.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/21653610848.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/18bihiqtsuluggmdq5qssn4g1s/dadadikizazubegolofa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/50971d004a49bc0260cbe4e0d9943caf/wowazidezalejivukawo.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a7943a5efaeace65f32612d4b7c6d717/toburaleruzawuvepadevag.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a6213ef4d0baf10f39154406897a25fb/9038108587.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/396cd98367da27a2cabc25c1a1030bad/66590059443.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2j7nlkl287orccc8t7iqr9039q/jiginunexejo.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/girupavupe.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/b090c89ac175bedf173d1f723560015b/27154105572.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07e62055b---jiterolekeke.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210624121541325.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/18307044187.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qil4ud8tpus1rk5p85u3fsgsm9/kojipodiru.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/jifegixuretaramivapi.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/vojudipija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+cancel+icloud+extra+storage+subscriptionPDF 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_off0000ea58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA58 11108 bytes
SHA-256: 6d1e28f3faf1820f8c214c4e300c216274f672b8df7172ec506bda23f8dc753f
font_01_sfnt_off000103fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0D 17192 bytes
SHA-256: b98a2a4307cb4ac2f76eef04399ca3e0be2bfaf816dc0b00df4d59164ea465fd

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