Malicious PDF — malware analysis report

Static analysis result for SHA-256 8379bb7e31440f3f…

MALICIOUS

PDF

101.4 KB Created: 2021-06-27 06:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29a85c2bac25c0726508706eca34cc11 SHA-1: 908578adf87420509a5b46c6c027dcab0bfd93c6 SHA-256: 8379bb7e31440f3f6af60e0431f91b4dad924a984fae3549f763a5bb309f4b86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcf33a8ff---vupasunev.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503094350350719.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/f0370ef4deb37c8b1cde306b2a20e1d9/39663343924.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i0lsakpgikho3avgdm4fk7p2dm/wuselofonuxafot.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13b8c674fb---60783399910.pdf
    • https://amblamy.ee/upload/file/fosud.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98fe71baf---dulimukidoxanagevu.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef77609987---47654713195.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37adb777be---20761899358.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/62295241254.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/89731bf9746165cea098cc6144f1ca8d/80417775525.pdf
    • http://rymwid-training.com/userfiles/file/telogobunitivo.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0ca727815434097555a0696232866115/14688150089.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/704b7e88a8e02f051e9111bb5cd011f5/47362010448.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/af6b93144648f4352d4b44308b61d302/dezaxu.pdf
    • http://st03.it/userfiles/files/40897879396.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/pp0krqci17ios83p7apdotkm5k/lamexenikuzosikoza.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85f3548d2ff47754dfc7d30c97ef19df/pokudufuganuwavodadajaf.pdf
    • https://jurad.eu/files/file/7548475106.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f66d3c974ea0b85525133d4fc94e276e/naduzikalumibavupuvagun.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11027b4d3---91709454448.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099078e6b462---17209315302.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1ba27dc3b---93353171839.pdf
    • http://canxetaianhduc.com/images/file/likotovebobozadejuxa.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f073fd9a2bc2bce3d3f4613359974153/57191951003.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1cf6d1664---fenalewul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=an+echinoderm+that+has+a+large+number+of+spines+attached+to+it+is+probably+a
    • 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_off00012721.bin
a47ef7ad9a52a93f61327bd903610eb1761b80046ddacca9ba06b947a17cc54a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16708 bytes
font_01_sfnt_off000152be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152BE 16792 bytes
font_02_sfnt_off00016ad5.bin
23d7634819e38e7a0b774087defac1a1bb9598a4341407ba6b39f47fddf73fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD5 11404 bytes