Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece05c514f6f00e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 14:36:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a78f5b468b1f846a5940daa21ff42fd7 SHA-1: 371ec130387088df9fcf2c308b623a3f86ade6f2 SHA-256: ece05c514f6f00e5fa9a8caad14b55067da672450a6fcddb3d54f417aba16819
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6181

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://duszek-lasu.pl/userfiles/file/wefejoboja.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613892392f018---kizisawamerakuxovejaj.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///71404118004.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/xopixokinegukazef.pdfIn PDF document text
    • http://tencanpowder.com/d/files/65467078307.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/3274747579.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/83415074680.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20219672185412.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210902020634.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/68045122420.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2e84846dda3560a8e7a0453432cdba5b/95631542538.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477834d9e4---98691121822.pdfIn PDF document text
    • http://minerva-collection.net/files/files/45998332894.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/zuvem.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c8f5b5a397f85170a3d898fe20a0e54d/gurul.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/69907400626.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/26846495992.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/39230004956.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/gumewerikuwalemabojeleli.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/padufibuvavufurufa.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/42280068826.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/levigomejunuz.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/munovup.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eq0j2c8vesgki8erf0lt1i6ja5/nidesexujodufu.pdfIn PDF document text
    • http://sung1.com/upload/files/vifesadorosovanuketodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+stop+apps+using+mobile+dataPDF link annotation
    • 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10956 bytes
SHA-256: bbd63067ea9f0704b2add8915cc9a4ec358a06efcb120212fddc659ed770277f
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 17800 bytes
SHA-256: d128cc873f2823ee1105d2ac63f6b7100dd0306a4998b5d35296a15bb31aa5dc
font_02_sfnt_off00012539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1