Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4692106efd110a1…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 09:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 01c90de3187ec8f59a0f56c0f934e9da SHA-1: 05304d312de272eb6b6b437c9c7663111051cfda SHA-256: a4692106efd110a1ef40ef9b812214ee86c0c983ee0b5fa5863cc63a5d6194e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware delivery. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the nature of the linked content strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=premiere+pro+captions+not+exporting PDF link annotation
    • https://medtek.vn/storage/file/68944373643.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160958ec280e53---13906887033.pdfIn PDF document text
    • http://bronia.org/userfiles/file/95891412783.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/tafopoguvon.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/38190878627.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f913b6b17153e15214bb64d90e0c1495/2548805268.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c5b1cf000f7cac0d8f89a624b00c6942/todelesodijavegivejazek.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac63c78c782---rekifak.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e9d005f19---kikokavawodubupaj.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/129ca548250a97fd858f186dcf3546df/85401028460.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/21c1cb10f79e55d3520597829469648c/semazibipulabukitozes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2712a62ff9---laxakuwurewekaf.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff58a82477---kudolisizovijutiwef.pdfIn PDF document text
    • http://com123.vn/uploads/file/pibezijaruxibopojobubikuv.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdc0f3b13---genumawubakilage.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/97905977180.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/xoroneti.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/85238383625.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/lijopunidu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kp0b81bdig040evvrk9dtm4q5u/tisurapiwe.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f298f14f0b---54675670905.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/govokolinikabepipelirirog.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/395fe3eacd762c803328fbd9b95751e8/bowiwomiwiboworibevosaxag.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_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 16932 bytes
SHA-256: d89001a47599b71ca1c7cd1c2521b1fc39c195b8ebd088e4abeae38ee11e7c86
font_01_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14459 10776 bytes
SHA-256: b609d83a82c394f44787cbeac712ccfc946568826ee0491cd29979d57961d044

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