Malicious PDF — malware analysis report

Static analysis result for SHA-256 426549b5a5a8718d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 10:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3525400ba7a46671133e4f54c87dcbdf SHA-1: e980270b579349fb379dd1aa27eed550c24789a0 SHA-256: 426549b5a5a8718dd211da66a8a8975c9a5e8f1e7be482f8d413614c72ab9ef5
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://doellefjelde-mussemarked.dk/images/newsmail/file/15582869014.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b8ed49e01581fe49c73c2516df86fff/bidilukovos.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85224364b8---zilifazaxopopo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/48966682113.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/83018759371.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd87bb1321---pipadalexiguferorefof.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/78g1vquqb3hsgg6sigtsc509q8/pozop.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/622df717ca793be9222f43181ee35592/tefoxufuwefumoduvod.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a45012457eb---32847977483.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/af9f8dfddb147b6eeb39fb853c279e44/94368097475.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9d4a174b2e7e000304a770118703456f/mozajolejabu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0adc763d954c649033bc3f3623595fc7/98216620885.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/1afmp2vvlh6mi6kfggh3i67vgm/jujedur.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/fijewu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mj13fp2jb1dcqtj31qopfuo8a5/18316746911.pdfIn PDF document text
    • https://keongracun.org/contents//files/xuzamupirupimokatasaw.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca34cc35a---92187924621.pdfIn PDF document text
    • http://cichanski.com/Upload/file/mizegalori.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pejobanebusufufovowav.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788bd296f---talibefibinox.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b90fea87a825267a7769d92f89a33999/50972834603.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/586acae7ec729c344cafd3b88165b2b3/bedopixozun.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/napaduduzuvovunu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bamasezerifiguxejipo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/72fa1cee3a18db77ef897128327fa8bf/kexumulavekado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=farm+land+for+sale+in+jamaica+st+elizabethPDF 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_off0000eab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB8 11048 bytes
SHA-256: d716e78d7774d03795a4e5b27765d99d2be9fc18a038e42738f367fc135e3ac3
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 18952 bytes
SHA-256: b10ddc3d75351d036385d49e045c3de2a2d52ff20747151da06490d7028e7a12