Malicious PDF — malware analysis report

Static analysis result for SHA-256 4864bdf1565ef09e…

MALICIOUS

PDF

101.3 KB Created: 2021-07-06 16:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4f702784435ec313874fc9931802d49d SHA-1: a0b83654ba463c7db22c3104cafe1b4a75c13923 SHA-256: 4864bdf1565ef09ec8bcdbb7194b309566217ccf863e7bd488e1d941e2659b9e
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=english+meaning+of+barat PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tuaqci8ohbh9tvinf0ot3rg1j6/26857434460.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/bu8da9c3jt7iacbj31lab2v5ro/76746456435.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8728dc00313de33f1c50695f60729170/motufeg.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/xitojar.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160834b9b2a56b---zasizane.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2c11cf52---wafimuxuxogig.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a87413ab8fa---nedoxefasabibizedenad.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160839ab9b30e4---dokomakuvudabibumori.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/jadizowegujolobamuwam.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160804973cbffc---16180038891.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bfae924ac---25418130257.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/4372479047.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74877862464.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4b5d075e---jazusudedun.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d618d30bff---fizuvedi.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/palizususukeguxiw.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/8361035510.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/kozopodisamegidemilabulo.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/32347464735.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d99b37a53ec5a5a41dea67609e2d3133/66347992308.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14853687139.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/15d81dad646d64486c3c80192e657774/47823178546.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8206f3841---vupuxokawuvano.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/27931712433.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001352f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1352F 19956 bytes
SHA-256: 4d0ef8d9bbe70ebaa0ea813ef11b9a6ec150672137036d9c66fb2bd12d94c543
font_00_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 18572 bytes
SHA-256: af0a5dd270a7ed4f525502e6d47a8efed3877c1bb272bdbe1c6f3633fa29982e
font_02_sfnt_off000156cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CB 10784 bytes
SHA-256: ba9b2b923aa31a9149ecc7b99d58fb1d81c7771bf7fb9dc03efde53e9b0dfa0f
font_03_sfnt_off00016f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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