Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3475773816ce79…

MALICIOUS

PDF

74.1 KB Created: 2021-06-09 15:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f70fc46a11efb4a44cdfb6564e5364d3 SHA-1: 57e662d1f80b915eec1c70bdc868816f5113d5b5 SHA-256: 9b3475773816ce79706a38892d2476830d3decf4fb9b33b4fe321b15ba421208
196 Risk Score

Malware Insights

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

This PDF document employs a link farm strategy, directing users to various compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to deliver a malicious payload, likely a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=inventory+changer+cs+go+2020 PDF link annotation
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b148d000b036fb5d8c30e981b2c0ef3b/witikumuzosimomitibupez.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/xilis.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf08781e9---49521024019.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/43d79e3550533e101a6b69c3ea242e31/dofiloleserigufogosodop.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e761b68f0---kukilipaletovit.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/6bk3fcthenrb84r846f0mhq4n0/mepawizorumerig.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/2c2654ee9cab1a98c960dcfb4f418530/xivigetolirov.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/13256483036.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d79ac47eda43664026a383207eb6c15e/sefinubuna.pdfIn PDF document text
    • https://invest.pl/userfiles/file/delem.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1c9b0134---98838031276.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pazopiwivefizofedegowizi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/db1d1069d850ec7b864eb085008caf87/99162761846.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/48957672063.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mijewutetilasazu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/kmrlolm9i33udd1du4245com56/24069251874.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 5404 bytes
SHA-256: 36f05141450615b41b8e14af2aa507f550dc47eda90da337392ce4521c80d4f6
font_01_sfnt_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 13036 bytes
SHA-256: 43bbc60392c5bc40558c72eecfeddc82958b4e347265d86a717966e1f72dff08
font_02_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 16068 bytes
SHA-256: 9e1271d681207e96fe60c94df920a27091a957dc81e2614e9e6235263a34fce6

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