Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecd859af12c204d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 20:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 37c6be38272cce45f50dc54705e9dcc8 SHA-1: 251b8cf2854bfd4357f4a28ed486286c57566746 SHA-256: eecd859af12c204d2c2e4b16fa1a0c6046acffb49535c30a03637316ff931ec4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to host or redirect to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing or tech-support scams. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=android+research+projects PDF link annotation
    • https://baohohoanglong.com/userfiles/file/vuwilaxagimefuka.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/68832294344.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nivofalotamusilifodo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332e4202993---tilagebujuzo.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/mesamitige.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/fajodule.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/45074739416.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/divitok.pdfIn PDF document text
    • https://subded.org/userfiles/file/lokigureruva.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/36244861619.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4dece7598d9e1dec986e9f67b76e590b/mipanokinuzaj.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7dfb06a14ead873e54235d5ea437b90a/fijonulipugibevejibexab.pdfIn PDF document text
    • https://chineseclothingonline.com/File/fezutedotedido.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/94736213054.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/92799671181.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/dewiraronokuvuf.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/letutozesipo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40290574344.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/vukimukunotararisijura.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/87538915258.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/df74cf05d87ca9338877295fe81cfd9c/6366353930.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/18576053123.pdfIn PDF document text
    • http://4rrecycle.com/files/file/68340446926.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/62564930677.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kalepuxuta.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda159c51f---23666575284.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/nejasiwusitibowezove.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 10676 bytes
SHA-256: 277d447c3f0a4a55a7701eced5a265a9ae75ea609c719f028cc58d0a7ff7cd28
font_02_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 17008 bytes
SHA-256: 06ae8e022896fa0110b0783143ed4f01826a52af9b507f513405c9590fbb976a

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