Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbef9f8bd4c8721…

MALICIOUS

PDF

93.1 KB Created: 2021-07-07 20:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da825f072e17ec9cf900505c70972d2f SHA-1: 4f6726eaafac4b461930b96916640bbee0442443 SHA-256: 9cbef9f8bd4c87216aa6a5b47171bb0c9f62552de925bee4ebdcb7af76ee3fd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8f93df9330f9a74e012ec4104ef14841/65075095090.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72bd4e4b---10649877904.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210512164706.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/1e1f11a49ee9eb27fd713bea4cbf60f6/19229553500.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/tarakenuvolilamutibod.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bazoguxu.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/fikajujarazasujuj.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/monuzojav.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/45062335559.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c994611b367---nokez.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pamufalexibolaro.pdfIn PDF document text
    • http://vodnik48.ru/content/file/lavezewidigabe.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/57096366986.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mebiduzewupelanozomupoz.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/kilazilokin.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/fatobe.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/jobipulas.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/raxijodorewumesofud.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/29794519577646dd999723e0451dc742/60277518760.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4a5a8e0cc---33176618659.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1c52293a---nilazul.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/06ebeecdb582e2c4f50892f2a6cfbe86/87716214910.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/tetibotalejegapatuzon.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/rumoka.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f3830ec0.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/93766003143.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/38178380845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=natural+polymer+is+a+polymer+ofPDF 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_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 18768 bytes
SHA-256: dd6e4a610c3177785655af9a26c456c8750c886fe671311e71cfec651b4ef3b7
font_01_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 10608 bytes
SHA-256: 0abbf89a5bae1e05913d276fa7631f801077ccdd15edc211f9d91e994f8c2b7a
font_02_sfnt_off00014ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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