Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80f2a8532b43645…

MALICIOUS

PDF

87.5 KB Created: 2021-06-30 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58e9441fd173d385186877c1ecc94302 SHA-1: c0d60bffa1141856eb4e82469507e1f3ab2157df SHA-256: a80f2a8532b436453fc3ebeb48a5f5bdeed8b77f8359dfcd39b2d9888b8c5f4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a 'download' button heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lukoilmarine.com/ckfinder/userfiles/files/25990559335.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7e7843cf9---lisux.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/005457039ca00af7696c6cf723791989/pafixufewe.pdf
    • http://bociany.sk/media/file/niduxuwebupaxodowibak.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef3e52fe06---vagiwizutaxoz.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27c1234f2---gogexamizedaxod.pdf
    • http://zetrade.cz/userfiles/file/jisenenawotezi.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jjbngjfsuvahc0rm6lrlmanjp2/kusagiselirimamotagerap.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81298518ad---94661023982.pdf
    • http://suadienlanhhanoi.net/upload/files/18990475507.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fa36c900---modovipelerisudilaju.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c313387f0f---fadojupusitasudaxarobu.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff59495377---12723605557.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097183161245---gubufe.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/uni8c1nk4bbd8ltctc9saf6a6l/85235974575.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a181c20117---14840779240.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a3406c68---53530710912.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/6852judr01j1jm156j07937be1/sizobazenatezodolaxapo.pdf
    • http://birnagarcollege.in/userfiles/file/3485799973.pdf
    • http://oreade-breche.fr/userfiles/file/pirexifideb.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/gavek.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16082a72232f96---7643594846.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ebf3172b8ba2528400fc9710e2057349/90274057147.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0c2d61a458e6127f135f4b7398733032/10176713003.pdf
    • http://lltsg.com/uploadfile/file///2021062408455970.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pick+a+number+between+1+and+15
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c1.bin
1a622a7d0af94ecfe89fc28c50365f57a1b1d0a59024707506fb49d32a1010ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 10804 bytes
font_01_sfnt_off00010acb.bin
0e92123b272ab2b2a0b1e235a07efb297471619a233e476fcba46ee0d7c8407b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACB 17016 bytes
font_02_sfnt_off00013745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13745 16792 bytes