Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94fb852fbf32b32…

MALICIOUS

PDF

90.6 KB Created: 2021-07-04 00:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a1f017fa7266af6a96dddd9109eaaefb SHA-1: 8125c4b7f9dc68364df775d6c5d445a42d227f6a SHA-256: a94fb852fbf32b32510f04161d8b1bb6058d4442c9fc7082584fe402884fdc31
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing vulnerable form plugins. Heuristics indicate a link farm pattern and a callback phishing lure, suggesting the document is designed to redirect users to malicious content or solicit interaction. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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) or Microsoft license-boilerplate 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 http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add671cc79b---23818464833.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ivqu5hua2v6dad69mukcpc2ltr/wuvinupapo.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gad1qof8qp5jrtt2qe79rmama5/59063118148.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e46d18c2bec758e2a1374338e600b25/73017878411.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/jopiwanetavejexubuxifeno.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd525e7c882---zejirax.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bfffe2ada---pejafurudojufopore.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c886c3cd66---vobamuvololaxojexes.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021062219434773499.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/sidubuzu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/4675327580.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe51015ff6---25714412334.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/wozesufuwivifewodolu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1op56hg03rtfh9sm2rtu3i3nqi/49475742768.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160794075ca99f---38251660282.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4ol32teqoufoqgrush9e171pn1/sezasazolola.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/mazonofile.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1caf5614a---mavaxuripu.pdfIn PDF document text
    • http://wxjsyd.com/userfiles/files/dodazodurubazabutib.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b366fae2e1f---pofasusazepifevuravobubik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=eclipse+36401+amp+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10892 bytes
SHA-256: c110779c886e2c677cb6cd1a8a66d8ec8173970cbfd0ee732d5ccf7d5da4ec8e
font_01_sfnt_off00011231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11231 19408 bytes
SHA-256: f80ebad1a5b64b2bf6371c4012af0e7e71e2d700ed08dcdaff277c16d5995a3d
font_02_sfnt_off00014580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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