Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bf5fbd7be8924a…

MALICIOUS

PDF

102.3 KB Created: 2021-07-30 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 87df0416b5d2ea66593706c1990d2622 SHA-1: 279bc5120fcfde35d1d73494b37ba4982a4c3aa8 SHA-256: 53bf5fbd7be8924aedeb2a47824134712915e6dcdd0def69ec1087349b322a7b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 7

  • 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.
  • 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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45ae7152be---94980740254.pdf In PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/drejrm4t9jin9halpcg68floc0/bokezapirare.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/13335409635.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b864239c---10914778125.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c564bcd5---66487673664.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/45869651984.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/logidekatut.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58b6a394f---xavatamotikomosejigofuku.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/113a2352b09f997c7e6cd43bf2a07431/nofixesatudedifosoxido.pdfIn PDF document text
    • http://aven.su/userfiles/file/2911246771.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/sanafukafesuwelenoj.pdfIn PDF document text
    • https://ptogel2.com/contents//files/dozakirame.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/suvinegiwovus.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/linekole.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/93921c234035aa19ea9107e4390df682/98721107010.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607990fa9eb42---43786221997.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceea7b50f---15887376017.pdfIn PDF document text
    • http://2440027.ru/upload/file/tonexudamujorinegizuwewi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160711e598da23---95520348264.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bb719e6a7---tajutazivepexilutuv.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e7693fa4---tulezogupipame.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a9a1e8e9c59542c6c9019f3a2e4e4a87/wodibijopem.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce7605698b---kubawipiradobedefu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/pamuwowodawemubiroxa.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/12387590298.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c0049b333e83b84d25265aa24291f87e/wojekojujeniputoban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adobe+acrobat+x+pro+windows+10+crashingPDF 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_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 18208 bytes
SHA-256: 07c5d90cb1dec96cfd8c7723c99fa62e599149e6244e4c34ec8fddf249d2f906
font_01_sfnt_off00015969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15969 11228 bytes
SHA-256: 36e5ac1c06fb5ab666d1877c4ab34044d90b78115458e069822b31aa1756c77e
font_02_sfnt_off0001735f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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