Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f25e59feabf925b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 22:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a8fa20f3016fb19ec66bafcfce292215 SHA-1: 4b410befc9bda0dedde0eda0cd64dd1c3a7b09ff SHA-256: 3f25e59feabf925b649a370ac41e66afa646773b4eaaa81efedba1d289130599
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute further malicious content or lead to phishing sites. The 'SE_CALLBACK_LURE' heuristic also suggests a potential callback phishing or tech-support scam pattern, where users are prompted to call a number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://oniceh.ru/uplcv?utm_term=community+development+pdf+download PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/3df88d2f1d99d66212ecb127f6f23864/46399684008.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/757f0f7d3e8fcd3be67fb84d017ca816/38661897776.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/kekizef.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6032f25b---19265861480.pdfIn PDF document text
    • http://afslab.asia/upload/files/55684528127.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/25916710285.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9eed1c9bf70d25b0b192f788022a803e/92413839888.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094d068b1900---19391701763.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zodemulasotowosiwuburoxe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xozipozewobojalufewewirig.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c3e249991b1158c75dd97846f08e8989/71270769493.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1425c161---golugenanavutekexas.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/ratodibotaxol.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/dedeae33c85713fd17aa5ab657971ed0/7153724880.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dee64a8c8c---mutibaz.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/lc3r8odc5cbsvakgcqvk7j3pj6/89643943778.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/19221074468.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/48486086071.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-10/20210510185026421020.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b4a112b9cbc19b6b427fda647e2a4ef/3866342496.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/39508477.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb8d507b9---xurirogavi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613087035e95c---27039468750.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_off0000d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 10788 bytes
SHA-256: 27da0164e3bf5fc801043fc125a3a93b28605bed15b1b9ce3189bd35702936ab
font_01_sfnt_off0000ef1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1F 17944 bytes
SHA-256: 7a67060f8c15093a3d5480f68663d6c512e7c2d1dae22e3672c9c4581747ba0c
font_02_sfnt_off00011d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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