Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec05934341b933b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-10 08:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4531fbb698b7fbf8b6800816f71c81cd SHA-1: 7ac30106021f233cc3ebab9d7ba08f37175f42da SHA-256: eec05934341b933b2724c0151d0ceabe028b68605cf738e488913e8113494845
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=my+hero+academia+season+4+episode+21+english PDF link annotation
    • http://caopump.com/admin/userfiles/file/33133062029.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/30177827382.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb454b16ac7---zeramaxarogal.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87110a161---28105485638.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/93683484850.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/brn3g5u0u1dt6s018kepbl8kkv/1675369158.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0qg6mra0cjjk8jur6l7smhf58b/wujifuriwa.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/vobaveduxonipenazari.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2591c40a---bipetivajiwemusulu.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/66026171041.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ec974aa08a0f4655a7580f009cd80c90/27263611041.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f6b7322f---lulefutaxiromarilamu.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/lazinulajebozewiwatebixa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/sirodinewo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a467103aebe---zixus.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccea073d83---95349587831.pdfIn PDF document text
    • https://plasy.com/uploads/file/wawajuxexowusirejibam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 4548 bytes
SHA-256: cb7558b7715e10c4aee647f5a7acc8244627e0479a3a405c00c2d9a5960597e0
font_01_sfnt_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 5868 bytes
SHA-256: ece3dc7107051476c122d2103bbf169eea9cccfe3a6d6401bc2d2a80c87427e2
font_02_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10960 bytes
SHA-256: 34882832b662f1d56388a483bddd130d3ff14a7f3dcc5d6c6705fa50471e9ce1