Malicious PDF — malware analysis report

Static analysis result for SHA-256 35223901969b6889…

MALICIOUS

PDF

95.3 KB Created: 2021-06-28 05:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1c4b9298c928ce0ab3e26df6dc69ab43 SHA-1: b39dcf682dd754232e80342e191a4d5b2f002000 SHA-256: 35223901969b6889dad9983d2949ff7d6e90f366de233a96586a32d2c7b670a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on potentially untrustworthy domains, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=sing+let+it+be PDF link annotation
    • https://liderpin.com/calisma2/files/uploads/gumom.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/14276933886.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/xogofuxebejakesanetab.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/16247233576.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/jobotaribu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/40930570857.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/23827070579.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/7320148181.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160773987c0f94---34609911268.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/j21vhmk3r9c3g8dmbu97g2en26/2494422274.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/22240680751.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/seniwemuliwixotuse.pdfIn PDF document text
    • http://derma-dts.de/files/file/fikif.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04ee32bcb---70554069068.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r2rujoagqp6iqnjti5o2qju7s6/25981260487.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/fazotetesu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8563da649c---kositu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/fde8255074b30175a8e194403b4ada03/90259487769.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/acc0b51aa6b4292aa6ce75b3513f27a0/90090943743.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160997261c7441---moduramixewupedidikikafu.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/35936114665.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/960e1f60d1cf42f51c10daf3a69607e6/6796257120.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927a0e6eb3---15726103452.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/80598111564.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001052a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D40 9948 bytes
SHA-256: 9e26b53989f1ebe54961ad7bdfe5104623a94edf637018876d4b8c6fea0a74f5
font_02_sfnt_off00013356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13356 20072 bytes
SHA-256: 2f8fcd3ccdf58a5a4dbfa0f3ac968d16deeda3b5acec619e14a4c8bf9967d5d4
font_03_sfnt_off000165e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E5 2272 bytes
SHA-256: 3ad98913edf7ff628953193199834186629620a023a7dc30cf3e5aeb70e4c7f7