Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba98cbb1eb284628…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 23:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d71641413c56c64087e1274e9d6877f0 SHA-1: c57c4240ecbabb90ef887234f4af9a5220c96cac SHA-256: ba98cbb1eb2846284e62f6ed17e330fbf565a238958c60cc394c25473b85312f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=unicode+zawgyi+converter+apk PDF link annotation
    • http://olgapolyakova.de/files/files/4161967695.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/92190300605.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/nojagulazeminomisovikobax.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138affdad16e---41729636344.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/97661181630.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/49370912832.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/d08493208fde390701307af0ed432a53/22189686697.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/503pedlmp58934bg5hvk3f0c4n/gogib.pdfIn PDF document text
    • https://csn-alliance.com/data/files/14787098282.pdfIn PDF document text
    • http://dges.in/userfiles/file/zatefudolirararedilokusur.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1ecddb4b---nanesolupanaxipesogunalow.pdfIn PDF document text
    • https://o-dance.com/upload/files/13501751779.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/81795900073.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/xulukufeviwejuxeje.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/zamaw.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/19294864782.pdfIn PDF document text
    • http://rooptex.com/uploads/49396337286.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/webukix.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_200206.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/91992824264.pdfIn PDF document text
    • https://kawanmto.com/contents/files/21873250860.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/takomigexefuviriki.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/65294670128.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_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10900 bytes
SHA-256: 3b127fb36e5c2c91d0d0f5d509079c8fec3c20d037932ee67d72c6f24800fe82
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 21552 bytes
SHA-256: ac67e5d9e68951ec4733dddda0b4a2fe9ffac403eec395b8ba54464e9b7ad106