Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcbf63e4ce5e47c…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 01:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2f221e2d9b125c138daf986f4c710593 SHA-1: 15e1c1ae24e162963682e959ad36b174f50db810 SHA-256: 6dcbf63e4ce5e47c65609589352595e98ffe55b258e00b9dc8e678db7a0158f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a link farm pointing to multiple external domains, some of which are hosted on compromised WordPress sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing pages or download additional payloads. The link farm further supports a phishing or malware distribution motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dunaweb.co/bg_image/files/58091771084.pdf In PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/68637516564.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc090245e---gemobepaduw.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jumuvodukugasu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/43584993117.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/89037523749.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902043656.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904235908129.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/920752848202489c354dfea4e2a297da/95245305538.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/80627656767.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/buxumirojeroxivig.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zafusuzemadoba.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/tozizozaxuvusasezu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pot5mhaj1spc66o0ap3pir3pe2/15375443232.pdfIn PDF document text
    • http://anm-av.de/uploads/files/kejivavababikevanuve.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2jsnnmf4e34v6rp9u65qjrc6n0/kodekatezelazup.pdfIn PDF document text
    • http://birdwatching.sk/media/file/18825840218.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/dibukudesepilaruwod.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/walerosanabosiveli.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/8746918130.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/45635870761.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/benudakirawo.pdfIn PDF document text
    • https://securitydm.com/slicice/file/kifexulimuwujulu.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/96912041632.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/totiduje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=english+shorthand+book+pdfPDF 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_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 16372 bytes
SHA-256: a73e7a66439c0f025cdf5723820ddf60951c10b2cfed77ab4e17761745e91712
font_01_sfnt_off00011413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2A 10860 bytes
SHA-256: 2317ad88a8e58a0968e04033907b3ed1d988835c3582502e737a42f77c86c07d

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