Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe0a57d3eb9932c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 05:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4734a6f0038826bc307353412fa1eaed SHA-1: d9680567b2ceedc4251d1bf3a13b86d23d49c3e7 SHA-256: cbe0a57d3eb9932c5a3b6a5147208d945a77d94d54ceef71e2328d0a0c8e4624
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to PDFs hosted on various domains, some of which appear to be compromised CMS uploads. The document body is heavily obfuscated, but the presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=contacts+from+android+to+android PDF link annotation
    • http://sungder.com/upload/fadapolaxemapoje.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/43818715469.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/71974009469.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338c99196c3---98827952961.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/turejelerotubipipop.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/93891804360.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/16261175022.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/xikemuwiredavexive.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/21963249722.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/34044695345.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/50124002588.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/tuzisazit.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/978be655d59a2afe52e0e774c4952fda/17775399357.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/85236890113.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109060154597737.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135d2ddb2c07---18219015550.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/wiromakapoligab.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/5783901907.pdfIn PDF document text
    • http://sinostandards.net/upload/files/rawetitutebobenesakexegis.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/86181892392.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/fesokonusotuvura.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/14042018203.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/22941248679.pdfIn PDF document text
    • http://schubert-hh.de/image/file/24811012854.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/50878895363.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/jaxukuwasov.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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 18184 bytes
SHA-256: 90cbc4116f3aaf51dcdb951fbb628338b6722e7cee7fabef13f4af07f95bffed
font_01_sfnt_off00010afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 10492 bytes
SHA-256: 8a679c0b36d73e57d4540a9d95e74c475c6f1e27f3f368bf7b8d5e12f267a384

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