Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94f013b83c90517…

MALICIOUS

PDF

80.1 KB Created: 2021-08-28 19:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b594e896f73d1c4d037433d8cac8e91 SHA-1: 8728e627fe1b8faab5263c56560735de9ad27fe4 SHA-256: e94f013b83c905176104a3aa967331594a3c2862dfd82cd9b2783e1b242e7e49
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide direct instructions, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alasclub.gr/neuro/ckfinder/userfiles/files/mimujubakifejase.pdf In PDF document text
    • http://orkoien.com/userfiles/files/72323030198.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gesowawo.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/3608127222.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/faduxemibetoxodunumu.pdfIn PDF document text
    • http://famillespourstarlight.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/9220760352.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c950fd9114---naparuxalefomuv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e4f31c7c5---mopex.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tqcqt3cg25e7d2ns3cmgtul4to/65259956773.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/6pf3p6gphui8pv37bbc2ck98k6/19431779323.pdfIn PDF document text
    • https://eventaipei.com/upload/files/59694131494.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db4fface36f---fugovupidufo.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/lubovoferirawun.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46f6dafa9367896bf5cb96042de25ea6/negalelisuwu.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/12341495863.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071684039aa7---57573416037.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/13628346937.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zimirilavoraputewitukaw.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/susuxupasexogofikupu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pcrjlt8t3k2c3kag3hmm3n18hd/57610965655.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-8-15/20210815054952780064.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/18295878230.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a80ccac53ca---38876360514.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cafc703def---61988048128.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b0d978ed---zuluve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jog+in+the+parkPDF 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_off0000d5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 17564 bytes
SHA-256: ee336637c14e6d23509cad75ffb49dfdc1870b55221f302cb959e0aff3727952
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 10400 bytes
SHA-256: 95930b0e8e08d1e9d9831e6efda2de6bd66d30d44eae7dda680ebbf5fbc0225a

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