Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a289ad2766ec09e…

MALICIOUS

PDF

88.5 KB Created: 2021-08-24 10:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c85972966229edab70e4e2f0cf0c1c7f SHA-1: 212111eb365b9822c2041fcebd53fda29342ab19 SHA-256: 2a289ad2766ec09e0a1745c71f414db91a5b6aef1626cbd6b5b0a1e8a6cf8d66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the detection suggests it's designed to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://uniquehotelsolutions.com/files/others/newuvefanuga.pdf In PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20b844c92---duwutuvuwitom.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/vovadosokeko.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/puwovavonavapavozamirom.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2128b9285---wibixeliz.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/lomogu.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/0i2jihp0mmcugbgrek3bh6ibcs/dagavibalegefatiburazisoz.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/veloputegoborobigiso.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/1590026295.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/sebasekelike.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608270012e6f0---zopebiwaw.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/9ab8c894535a2689139ed4afaefe025a/bapaxijamajalofifol.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/60517731261.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/sopirenokeweposefasolot.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbea22f14ae---rekuxu.pdfIn PDF document text
    • http://nova-auto.com/upload/lififetenoti.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/nemaputa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084796936207---64380386526.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/24623372753.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/wokelatujoziretofiramekad.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/49962724064.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/taxeleborazuxox.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606c904c51ed0---61274678664.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/50582594556.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/kozenokada.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff87af87a---fojawitiwuseduf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+statistical+analysis+of+time+seriesPDF 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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10676 bytes
SHA-256: 95268a48e3eb958abe93d543d4fe2c74daa5b816b4c7f2f53427a949d3537c1f
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 17548 bytes
SHA-256: eb6643feff2e5cece0d3b6137a50d479649f9e2a6b3446ac9cff00ea08860a4d
font_02_sfnt_off00013a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1