Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cd374d9267352e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c46a367016948f568c3e0fbb9366d32 SHA-1: 7715ebbcd4ddd0a772de73cb276fa63520aabdcb SHA-256: f2cd374d9267352e89b2a274b7965148a2c3e9a292856df8b08ef614b4260fc6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=totally+accurate+battle+simulator+mobile+apk PDF link annotation
    • https://telewebmarketing.com/FCKeditor/file/4117263361.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/puludumefomevabojikafezos.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/zebelinamipugititalep.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/rotomuniko.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/56681823285.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/20465583221.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/3607096153.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/ritisevenazonadim.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/74920034569.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/53427098041.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/58568447749.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613781f363bd1---votixojiladudoxaxevaxav.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/67370280160.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3ed6c129873a3054a533ee69bc54b705/zowisitumasure.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210917_235352.pdfPDF link annotation
    • http://copingconversations.com/userfiles/file/burugiwugiri.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/91656152320.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4eppat28n5k2fh4i5v2iia39b4/muvosuju.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/giwixexile.pdfIn PDF document text
    • https://jobtiara.com/files/files/96013108773.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/xijunokulodoponulijamoza.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/83788233795.pdfIn PDF document text
    • https://granitnet.hu/editor_up/70925456462.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_off0000adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF3 10840 bytes
SHA-256: 3731c8b9538b9320abbb4e474d318c0d323d24c0cbcc601a4ee572eddbea8c13
font_01_sfnt_off0000c6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D9 15884 bytes
SHA-256: e258f2fda4eb72698a4e50496003c70b81a2910a24ad4eee011ad035b85118e5
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1