Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2b7bcf0fde58bf…

MALICIOUS

PDF

72.2 KB Created: 2021-09-02 02:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b50e20432b2c26cded35e6a029d18d99 SHA-1: 9bbc9865613c1eabf0f95efa049cc05561726f2f SHA-256: 4b2b7bcf0fde58bf00670c52e406e213e07f2d60acca6484df035afcd74b14d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to lure victims to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/uplcv?utm_term=wilkes+honors+college PDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/32889814934.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/99885440338.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wumowilixeromusuwizef.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/suzojidof.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/20597857713.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/d955f9771cc665593a4fe3fd4029911b/2368442189.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607147c7e9730---8164784482.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b5eeb4a4ef7a94f74950813d72e2b4e1/19241172476.pdfIn PDF document text
    • http://hrudolf.com/userfiles/24573677502.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/lexepewukepoduji.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/satusi.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/f9vi17jgu0og3uv7ceahqcfuhe/21817891711.pdfIn PDF document text
    • http://ippon.lv/uploads/File/11747025386.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ff3b59d66---50474257847.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984573dd243---99524794513.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/27607404550.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c58328e7---kozubivuxux.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d824020130d42cb745773bf8e3f37629/62170725896.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/80972351388.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/90122895782.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609826d8c4e3c---timawegotow.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_off0000bc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC22 15364 bytes
SHA-256: b1d0c4ff20774eedf43e3ed9eb61a6ffdd58d16d8302953af5a82afbfaeb5130
font_01_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 10336 bytes
SHA-256: d254e6b13b1f048d2509641bd4a9897300d7e63c2a43068f254f230599e2196f

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