Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbca3b1ed36afbd…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 21:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca134a3828138ccd7626a6fc80fb14dc SHA-1: fb13e37a2ba959bd307f4b56e79372287a64dcce SHA-256: abbca3b1ed36afbd20f2f7d9db145533c1318135e0ea6eecfa81794385afc5e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded content indicate it's likely used as a lure to facilitate initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=agracejo+propiedades+medicinales+pdf PDF link annotation
    • https://thediamangroup.com/_images/files/buxado.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/borovasifewowubigit.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/vaboremebegozikibujoroku.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/pemawiwufibidetilikivomob.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/fdc5e3cc26c73d133f6b04cf8ce6be9f/24931353585.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/wawatipuvupares.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/66795809644.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d54506f2be4---gememi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae3729af8---rakugaze.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/21656735757.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/33045ba343d263b13b57ec4db8ef66a9/felevokemuw.pdfIn PDF document text
    • http://polletnv.be/uploads/files/47754650299.pdfIn PDF document text
    • http://clarasonic.com/upload/file/nipal.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678ab9ef2c---55923719814.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/xazagesegofewaxivamez.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wunenesamezunaleliletiweg.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/38118563486.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/22464465516.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/b4tass67om1erj4kid5iehg913/89941780407.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/ladosepatodesitofigeb.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621284442.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ca144a09af802ccb90791d52bde4634b/12808318275.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/71146408867.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c1728a15---sedobigubixanexetikidud.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/noj2nma7lvbcq7jne4e79c22u1/funopusinuzi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10976 bytes
SHA-256: 372026fd9513c18dfc47398388c094f0ce88eb9fe563f8b0a52e6de57230a796
font_01_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4B 18312 bytes
SHA-256: d68cde42f976e0278fab3f31f37999e4d75eae2edcafeb808d09b6c9a81158fa

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