Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ab92fcb0a1777d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 13:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81c1fba3b55894c4a3f64cdee1fed938 SHA-1: fe90853e454464382289ab0d2454c0d1a7bb7f60 SHA-256: 85ab92fcb0a1777d66d524fed32212760c95aa0852c383a2cb85080cb16a418b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=download+android+multi+tools+for+windows+10 PDF link annotation
    • https://menokatea.in/ckfinder/userfiles/files/liwuzowiwina.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/71796053568.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109150827207489.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/6318154276.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210903020113_274089928.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1615227ab4577c---43568081484.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2em5hn5ntt6ernvdva8nlsbqn8/93280598987.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/refikeponuge.pdfIn PDF document text
    • http://www.moyekolodin.com/files/madadibu.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/12028470663.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161480d7fcdef9---81090593473.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/48193956909.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/45379120351.pdfIn PDF document text
    • http://ranchobg.com/img/file/89180558585.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/xusofipeziniditezile.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/najegutoboxematurivekok.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/xoxififigazikefo.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/70316956082.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f32f2651---99186077566.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/28478320689.pdfIn PDF document text
    • http://scsychem.com/upload/files/85030442039.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/vokubulepufivesofuli.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d436e4bb9c---45163358790.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/2970740342.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/webujoleluvev.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_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 10744 bytes
SHA-256: 064bd9536421a04ad178460a0dfdbffebba9277805fc450f9b6a346ed78fdb9d
font_01_sfnt_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 16248 bytes
SHA-256: 69d54564ac4ce77c1e42212cd743dce9c12bd4a9dec27cde3a2942ee5badb509
font_02_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.