Malicious PDF — malware analysis report

Static analysis result for SHA-256 a147d8e5b6b04449…

MALICIOUS

PDF

75.0 KB Created: 2021-08-06 05:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a23df213bf320f6f33abc6d21a3c8ed SHA-1: 07fd4d781dad8f7cf5caac6deae31e6eca196668 SHA-256: a147d8e5b6b04449873f44cdf3e5c7742cb77fcd0e5fca56d85545857f5ec03f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=thompson+%26+thompson+genetics+in+medicine+8th+edition PDF link annotation
    • http://designbeginnings.com/upload/file/93423144254.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/lcp0sabpkf1hft6n3p0p4680v5/xifarobajoleme.pdfIn PDF document text
    • https://vzglavniki.net/data/file/89018329683.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ff3c8a9966572a8a344512c256a340b7/85441235484.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0ainpbnkga77cosvvubukhp9ea/benitawuvakifopope.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4766dd13---24099701666.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/sunesavujoleg.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/vusuketigadogavinugagamov.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1472be8c28c68de6c52fd7697022950d/73758501535.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba8563d4f---zuzeguvegewojuw.pdfIn PDF document text
    • http://sjhtractor.com/d/files/dijuropagesigiwufewu.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/perekusadipuxavazajawemu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/63561720889.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/86954968449.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cf0c3d03a---40495165379.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/55114061140.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/96570195246.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/waxudurax.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/zalukirufapep.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/30107028274.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/18138433635.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/migukavujilaki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6ED 9844 bytes
SHA-256: 5cc6d15c79b18aa8f74a1f84686e0617701ff0931c80b5666cf58db8b6080d42
font_01_sfnt_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16352 bytes
SHA-256: 6f5a964d837aa6e3468be7159c0e6171baf81927d44327a6ec28b8c3c7e0332d
font_02_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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