Malicious PDF — malware analysis report

Static analysis result for SHA-256 a154a57926eed312…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f0ec09a04ee145e7e71337b22a4ab5b SHA-1: 82a3422be586c1c2a306aa03f1b6486886960bb6 SHA-256: a154a57926eed3126af4ac41e7cd10afbcf8bd2ef238719718dae42de27d0f8b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the heuristics indicate a deliberate attempt to host links on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab14e5e464f---2297021193.pdf In PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/68844586836.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/60604640564.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a289a6b8384---55968866554.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210727_AD7857F9CCFBEF7B.pdfIn PDF document text
    • http://bscartridge.com/pic/ragowazifilumatedifafutam.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/62357990042.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1qhh142i8c9lqg3vcarb7efjc1/vukal.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bajiloletufizavid.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f711ea863---50463735446.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eaaed3bd---galej.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l2lv8tj3mnebapd8johlqniqb1/92513972692.pdfIn PDF document text
    • http://asustainable.com/global/file/pevaxizuvobefi.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/meleputuwosas.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/89ac41f4206882f088345b2a3e8dc153/65609421051.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/84846455558.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/17353791715.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1be7d514f---nulibekudelapido.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba36ea599b---42016967142.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bbb38e---nifabemopudos.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/pavegoxur.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/55804418121.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/9adf1fe37b04d954ad2c3264de06abfd/13652382678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cars+2+tamil+dubbed+movie+download+kuttymoviesPDF 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_off0000e1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 11156 bytes
SHA-256: 939c7583c7992892e1a4a06b7641c7a497935f655a19bec01683d3116511532e
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 17048 bytes
SHA-256: 483f0b4099a0a92441a36a6219389e34f039713dafc121ef80a9e7fd9e242e5c

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