Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17c82cd70c47052…

MALICIOUS

PDF

86.6 KB Created: 2021-06-29 22:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb62c41be048157cc429d19792c6f1cf SHA-1: 84213ff57272a2e23e080e26df436e307ed76da6 SHA-256: b17c82cd70c47052bdafb7006e7f18457532670be41a034c328b6ca19a680b78
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample, but the structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crysiq.ru/uplcv?utm_term=babe+meaning+pig
    • http://aarogyamedico.com/userfiles/file/raferemalikejumevibokaze.pdf
    • http://narnivet.com/userfiles/files/vuwadugeded.pdf
    • http://alexlunacoach.com/img/editor/file/83196471319.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6eb301643e---nexapugup.pdf
    • https://securitegenerale.tn/userfiles/file/58900213525.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c6b101184dad0fc8f71b13147b0a0814/xowekoriz.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608516a55127f---53653436377.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b452238c379---65335808677.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728004c4eb9---52185634376.pdf
    • http://cropscipublisher.com/files/upfiles/file/busuvasufez.pdf
    • https://calmoinc.com/upload/editor/file/ponewerokazisumoj.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4eo69ucjgg3gh4abnvi1lcq1q4/68925564464.pdf
    • https://inijariku.com/ckfinder/userfiles/files/gosapuresemupikubapozuduj.pdf
    • http://kwong-cheong.com/userfiles/21927682731.pdf
    • http://erdivigado.hu/userkepek/file/nijowox.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/98ee2147a855c4cbd5d6e3b0255f3a17/tafasepawuvadegitur.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/24357343647.pdf
    • http://teplospectr.ru/images/files/mekusize.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f960ce38e9---putozulufo.pdf
    • http://kasaitogo.com/uploads/files/bumuputopogevurijikij.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5ac8e508---mewupasujap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b2.bin
f6172d6fdeb0b5a07946ebd3148c3398c455e1c46796dceaab2776c407f020b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10256 bytes
font_01_sfnt_off0001097b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
font_02_sfnt_off0001218d.bin
b9e2f1c580d8f94456731eba11f45a34daf33da84ca5542cfe48d66bfc8bbb0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 17332 bytes