Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b582c5149797ff…

MALICIOUS

PDF

127.3 KB Created: 2021-08-15 22:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 12435bb3271fe28c897f9bf54cceb3b1 SHA-1: 7fad72a8a5ab7e5365449de2e2f28d96f06ceee2 SHA-256: 93b582c5149797ff309ecb11a981132462c6adc91a605aad06e9eb59cadc9897
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://inwebjor.ru/uplcv?utm_term=how+to+cheat+socrative PDF link annotation
    • http://kagoshimakojintaxi.com/userfiles/file/8980846922.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/11054594425.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/1789143496.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/busixuvopagosejavito.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d51ln29bvbu3lj04moq4fanom1/bakudob.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/xaluse.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bfd56a0ed---37286281796.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e1be834b---kunadiji.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983164a562f---gibolox.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/gupifunamusajeluviz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/3936613506.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/kekusutogopasirire.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/95637840822.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/37913429911.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/senipodabuzel.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h01v5kcl3kotqei5s4hv13jah9/16086378847.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aca71d00765---37128233318.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/57163760039.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976efb3f039---zavebupisijisujib.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/63e852129e310e2fa0e3e2d4df76041b/woroxubivu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17244 10320 bytes
SHA-256: 079dfdb5c9af528e090e0596a755790c7163f8ea41e13b93cd4ab5efb6611f40
font_01_sfnt_off000189b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B6 20556 bytes
SHA-256: 28a7903ede56f590a59db0b7e2c3225c5b4f4dd3e0a5413c57b71215bdb4d855
font_02_sfnt_off0001bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEF4 16508 bytes
SHA-256: 65ef66107e1051fa65493f44609d67943f45fa79412b0995efc57a8df64b2e49
font_03_sfnt_off0001d5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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