Malicious PDF — malware analysis report

Static analysis result for SHA-256 8009fa12797ceec5…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 11:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3c81ee58350afa13db873f167ac4dc7b SHA-1: 9df9115ce042a84879138361644be79138b6227b SHA-256: 8009fa12797ceec5be8ef5c1fa4276fa27be0dcb1e2a82ebdad6ff6b36d6312f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDFs hosted on compromised websites, a common tactic for SEO poisoning or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://rudolphi.nu/userfiles/file/86276290731.pdf In PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077091b4f795---34739631365.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bac52fd47ab08685dfa5dc8621b4f34/bananowo.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/fatewuxaletokomipirisuf.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/xurivike.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/6612981008.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/44956863047.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d640cc5a2e5---85518611011.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/fd945c90417c82e2f63f2683c25bf260/96111108687.pdfIn PDF document text
    • http://effektfilm.de/files/file/46479212777.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/48652261158.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430191427706812543.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/q9ev5b5s32pd00qg76ogsa934o/84036086513.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/bojapurukefesewuj.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/70326131736.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/21815666640.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/24f1e4d0a3268c990d48eec86c243d35/19856963873.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f3r3d9t2o8b1ktp1i0r9utaitb/tilafobazavelixuruvupaz.pdfIn PDF document text
    • http://rurisnet.org/images/file/luxatajuzufilipimuwivexa.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4b967t6n7nq1rvgo49pob8hfq3/5015030515.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8d12e34dab36f4f5e65879162c1612a/sejokol.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef0cb092e8---dosuvidezufisamovoxi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c376c1d982---38683182026.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/biwubetadonuse.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/25547245443.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=competency+based+interview+questions+and+sample+answers+for+managersPDF 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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 11648 bytes
SHA-256: 3c1a6b2f22adde23e4c3f5bb097216d31dbd45afe61c043d8c563620d2348e34
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 16024 bytes
SHA-256: 58e8e67931c439344b1b343a39ff0c30c2541fbcc0029c2c69783e83776cc7b1
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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