Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a12dfc36c23598…

MALICIOUS

PDF

87.3 KB Created: 2021-07-04 12:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9edf37349305adf388316bb977437a22 SHA-1: b4e0d8d7bd1fdaa046c773ec337a5dbd4e91d584 SHA-256: 78a12dfc36c23598e96d34586baac74280d5dbea675048c437c41ea1ff47231f
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs point towards an SEO poisoning or link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://lemanssrl.it/file/bobet.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/vr36qac81hnq65trh85iduti30/kojol.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/35413614902.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/zunanesem.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/8b1fbbe946bfa193f9c0274147c42e3d/miwororobuvew.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/98168437609.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/57667085564.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3e8443ca8---sezijog.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607559c426129---91736226630.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/lafug.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822800cbefd---sunadeviluv.pdfIn PDF document text
    • http://htwy.com/upload/file/39201441545.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/f621d8a8f4fe661c0e8fc10639cd0bbf/rokolotakeliresulodu.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kogeromefukifuna.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/0f1bc87d44c49516f1f6180df68d3b45/robagolop.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72737b4bacba6386cc7a3ad59c833e2d/52874894985.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e17acd9c6f7630e8463fffcd8eba36e0/84383765004.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/xovutubokedujedup.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/pakiwepamomasabuguxo.pdfIn PDF document text
    • https://businesslife.com/content/file/60680217486.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/1535859797.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/9871969293.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/hl3spu7t53ok8p313it4hmcfka/rujokag.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/3afa4b43c520e28bf4cbdfdbbe178aff/xupaxudejijemabaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pickled+daikon+and+carrots+vietnamesePDF 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_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 19776 bytes
SHA-256: c166ea38046b4672e7b64fc72e8bd73d5b5f4706572fe2c413e2b503e182ff3b
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 10688 bytes
SHA-256: fe03e8312a3a6ecfadfd6d282a20a930b8f65b0757389826f049007691b3727b
font_02_sfnt_off000137c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1