Malicious PDF — malware analysis report

Static analysis result for SHA-256 2edc14073192ccd9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 13:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44529953066715b80f8949b386ee78ec SHA-1: 04a01d91b4485ce96168672db4a00df9fde1bd82 SHA-256: 2edc14073192ccd9b8c19c3ce67fd0a5f6b822b3388a65ce25f007dca4922783
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS upload storage. The embedded URLs and the document's structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://titishop.co/upload/files/zemufuwi.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/bcb18a81be986cc6d001a0414fca2eeb/73465883515.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/28260310125.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/zevenexunaj.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/43387313530.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/wugirukuzakonazupe.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/gapafivob.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/52999161111.pdfIn PDF document text
    • http://ud2-140.com/files/fiwunidamasikuvepuno.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/kofogufu.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/77644551303.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/gumilozupipanisiwur.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210901051133.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tusavaralagedagaxowabotok.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ab8cff4cfa85ead221274ff7768786e2/rilawupo.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/14918480054.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161314c84bcdd8---95071979801.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161319b650b697---93638001684.pdfIn PDF document text
    • https://iwistw.com/upload/files/44328177522.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/57321868405.pdfIn PDF document text
    • http://computerdoki.hu/user/file/punezesunawakovigedojej.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/xijagulaburif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=compilare+moduli+pdf+androidPDF link annotation
    • 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_off0000afcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCD 10524 bytes
SHA-256: e30b861796b61ac1abc3e948881601aa6cd399837123581ee84845f828dd9421
font_01_sfnt_off0000c79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79F 15108 bytes
SHA-256: c2ee8d5d807db7063c0a9c53346476b1384fc78847ba6fd0492b906dd5a020ee
font_02_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1