Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5b1c2ec0006e3a…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 21:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3982eac19cb6299edacc0b2d7564cb1 SHA-1: 27afe995246c785d0e80a8af0760ef7be8d31cd4 SHA-256: ea5b1c2ec0006e3a325546ac1332b241783aa0ebb5d2a5727d0ecef428662766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous embedded URLs, many hosted on compromised or disposable domains, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/27jkjkkin0urh08cab8berev1d/71716333372.pdf
    • https://hotel-la-licorne.fr/userfiles/file/roxezevegerozaxesiwedawo.pdf
    • http://meble-tk.pl/userfiles/file/jumudifepo.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a61dc51e8---pawumagadaw.pdf
    • http://slsnn.ru/content/file/jesuwigubalovog.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/kesuxovorenunawuj.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff8e96258---ragerufikavarirusibetoke.pdf
    • http://aftckwt.com/uploads/file/kaxerosefa.pdf
    • https://maxflowfans.com/userfiles/file/63630388063.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/jedafugexuvi.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b9e55416327c43e4af74263d8bd6523e/55156038388.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac62b11047---19893047808.pdf
    • https://privatecambodiatour.com/userfiles/file/dugoxiw.pdf
    • http://mousike.it/img_ins/files/betojugipufefepemejaf.pdf
    • http://15889163.com/ckupload/files/jeraxazuxigufitav.pdf
    • https://uleshuzataruhaz.hu/files/file/93152848081.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/2764b45f275064ea1c7ebd73e0b42d85/47504626592.pdf
    • https://facades-et-traditions.com/actualites/file/gagubotebij.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c7b09f5c260cc2f55c0bc9ff71989f7c/88629956679.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a818cc88662---36579277837.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f1ec3594---dikawoxumowuxexad.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5111c373---85692180496.pdf
    • http://yaqeen-eg.com/userfiles/file/16626151107.pdf
    • http://isystemlab.com/admin/ckfinder/userfiles/files/kikalafeluxolinigeno.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d31ad0bc48460ddf7f7438201d49cd38/wifizevenutolimodab.pdf
    • http://cafesezony.ru/fck_editor_files/files/94616008227.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=good+morning+images+for+gf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 16792 bytes
font_01_sfnt_off000101d8.bin
9891bdeb6e7d6b65aa2f4dc32e8a1249c80d0fa08cb8f9eaf331c83902549828
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 17624 bytes
font_02_sfnt_off00013009.bin
ff8cb87fe2ab21689dffc133d08eca6e62098d85fb92e6bebe200e2346d4f78c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13009 10592 bytes
font_03_sfnt_off000147f5.bin
c74879eb49c01675629a1780d6c56244664560bac07a6b78f0ad4f8d59e4cc61
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F5 16252 bytes