Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a100244a29fc266…

MALICIOUS

PDF

84.0 KB Created: 2021-06-10 03:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f1ef7499f0ebe877252ab49631323a18 SHA-1: e604f1a1583c6bffc3dd4aaeab024e8a72c0b472 SHA-256: 7a100244a29fc266c21fbc4b387f1e87ae6240a1833c33921c9a484df06fbf25
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The presence of 'utm_term' parameters in some URLs indicates a possible SEO poisoning or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/uplcv?utm_term=call+of+duty+mobile+apk+data PDF link annotation
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9e97313cc9cb4549c41ce8e8cfcd6bf0/puvuduwezaboze.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970fe4399af---xifuju.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8233c3a974---87140870237.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9cbbf2afa86fae89d489615d41952576/tukikada.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/700f7e8d393410bb1fd0ec822eb509b0/78805152671.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae2ecb7ca---jazipolebiwegeluzajuli.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/7b7fd71c5bdfa3bde58b3854e6479cee/kodavir.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/dabinor.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/99f28916bf856b1a34b749995f8699c5/78489741781.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8c55cf04---soruvanajawikibuxogomofop.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/26129248937.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783152761fd---tajufefaminomejaju.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/97770517613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 5016 bytes
SHA-256: f7b51c3253607dfa00c74ec4c80c98fc7a8ad6ac5ad3080e3c1ea8719e34127f
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 15944 bytes
SHA-256: 34c0af74cf7948fad5ad92e1e8494f6a82ff306e487cb34e595728d35a76538b
font_02_sfnt_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e