Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc5a3b8abb879cf…

MALICIOUS

PDF

166.8 KB Created: 2021-07-06 12:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc33d6918c173ffe2028bf8bac37b7b3 SHA-1: e7470c1012299a92e00d0c1ba1281723def3d48e SHA-256: 4dc5a3b8abb879cfd2e6d24192400086693d7490510f127b9d8c8d8faf0f149a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to harvest credentials or abuse multi-factor authentication. The embedded URLs point to various compromised WordPress sites, likely serving as part of a phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1d05c2e32efe8e00d1a5386c940a6a63/23787564896.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/857e770f81bc4b929af912b28e0d6557/4937224070.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ddb8a96c8---vagadatasitatabefizu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/06df9a81c0dd7428538d258ca48b14fc/75142811675.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kd77kqg1djsfvn1a92790glike/buganaxiludegelewobitoni.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a989119fec2---lovitulanorimerovunolifup.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079148a6cebb---21242316597.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bezezeguwelodepejo.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d911594681865b8963a39107a342eecb/54566187100.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b8bed20e---86864210085.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/14924813629.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/76315423306.pdfIn PDF document text
    • https://magatek.com/documents/file/kifevizenulovamilisijul.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/2954539668.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb55f7b36a---terazirusotudavipeturuga.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/73781009208.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d0e914964---96056304330.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/qttvbed05jb2ruj1m3di3e2o8j/20979275708.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/18842904026.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fe741c2794fd654e3de35a4a9ba7e539/rorizax.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/tunefotaw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e403e90af64---70521386006.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/vosijejusiwanikip.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/bumugozixesilajudinaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=words+that+sound+like+shPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000209fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x209FB 24260 bytes
SHA-256: 29df25adaec1f7e865499756409c66690522f99ab6fb8162c9de4914c89ac06e
font_01_sfnt_off00024705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F1C 10532 bytes
SHA-256: 1d665be7527aa06d1c759f610a71b9461b73813dfc5de851d10d277c1edb190c
font_03_sfnt_off00027704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27704 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647

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