Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a57aadfa5cba5e…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 21:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 205c6dca84a26803c6e2cd487cd2c732 SHA-1: 36d93548a1f8a306fc60a6a405160d958501851c SHA-256: 67a57aadfa5cba5e6f35622182b065abc4a8fc4ee96659fb79d122d65b2c3348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of embedded JavaScript, though not directly executed in this static analysis, suggests potential for further malicious actions like phishing or malware delivery.

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://huntic.ru/uplcv?utm_term=one+day+at+a+time+sweet+jesus+mp3+free+download
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a750f26e2a1---dopofavak.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b73531c7581---95304049839.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a881c791c24---karusoxinasokudonafemoteg.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9278fd80751892cfd517c1166c325968/fudomat.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e47381lsg6mgvovtrhc8cgcrb/58483429888.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abe63017e02---tizixifamuninasotitak.pdf
    • https://avela.md/userfiles/file/70429601213.pdf
    • http://www.sport-konyv.hu/userfiles/file/zitipurimunenuxidowera.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d0f0f619---tilotirovetutarux.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fac69631---nulupefigete.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/712b86ffe12373e290febe47f5f01ea9/2285034865.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/4705af17b5934c5d3c244c137e4dbb60/3646309551.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/1auscqap49q4rqugg30qp7lt80/78029788692.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8d73649bdbaeafdbd2faa8d20fcdc35d/62943699635.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f9c7bad2---57960800714.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1af0c312d---6235626842.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/4dcj9f65i5eorlfcv2k4tpfd6n/vofusava.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/77eadfa43e196b099bf564ebd8f2f353/rejunabukowamakawawisol.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/8qkv5jd4i1tvf3th081e6lhf8o/50780860752.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2mjpk5ctt3apqg0eu9u6jsi71q/58031976290.pdf
    • http://thedewakohchang.com/image/upload/File/2150957211.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088452c4a461---sijodelefuzagutofi.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c15af69a01e5687556f459e764043d47/defipinotepika.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f2d0ea53---93643099765.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5f8f615a2e306bcddd11782c2acf28f2/60499510719.pdf
    • 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_off0000f824.bin
283dfd9d6321cde25319020417a12f4c58410749dadf744e40d07915e5191f0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 11284 bytes
font_01_sfnt_off000112b9.bin
c6b606f0e0e92c75922b58c7b6f5a89e7dddd4b0ab67db000a4f14ab039b693f
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B9 17404 bytes
font_02_sfnt_off0001404e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1404E 16792 bytes