Malicious PDF — malware analysis report

Static analysis result for SHA-256 6535d86bf040ee45…

MALICIOUS

PDF

99.2 KB Created: 2021-06-29 19:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1b29c6b5e428894c450a5037c5d4e3ec SHA-1: 14da17382fc00a6b23042cd37e8e925fc4b9a6bf SHA-256: 6535d86bf040ee453a459bc292d7fa8e9b27799a8bb031ac1fd7f17576e41d00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the heuristic findings of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM, coupled with the high ML score, confirm the document's role in directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 https://catamma.ru/uplcv?utm_term=what+kind+of+simple+machine+is+a+pencil PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607885e8a2d48---wiripiwaxobo.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/17499455503.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607577d43e229---54124246947.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/fexasigodaloxebamat.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/28937f3a75edf5819b88f718770b8c9d/pokuduwixedemomutimapufap.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/7041943637.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/fiwolisibeluworajorob.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/zujotetenozeloko.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/jajofurofa.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b08df030321---masegulifomilukafanako.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/37085971266.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d824e823352---dosoketolosozotalu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/51a5b563c9d779bf09ecb7fb5886f087/rufusababivetifabum.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f8blh2vuh4cnuefv8qp3pnmgc4/23060144671.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/71285733225.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/51303609309.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/6ace153b8684c75f70d5e66084ab6dc4/77841403665.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b85537e000aacac4896d7ea034fcf888/42750943621.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/62961518863.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d50a3ff35a4---zobupagulu.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/85643456513.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/u2kkk1vh4518iuee5athv9rkga/60451429993.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supedarebisetelepamif.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/de4fd01bfdb915d27e1da5f001e15515/munivalebofojijor.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b5bfcb3e2c410f3e319029f7dc66bd59/zuvivokuzipevarapisimi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/10402556013.pdfIn PDF document text
    • http://berbun.com/user_img/file/53726978016.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_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16536 bytes
SHA-256: a79d4d8023d197b856906165b1cf6e0e2b073f7796ad424e9129db59b8c1daa2
font_01_sfnt_off00014cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000164c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C4 10872 bytes
SHA-256: 79f7c46d75516d9277114a902bc3693b3b6609676877171c9af9512f72b021bb

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