Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10b2c3e215a4b58…

MALICIOUS

PDF

122.1 KB Created: 2021-06-24 12:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b9cb73391c838e230ed34ddb12cc7445 SHA-1: de8b14310f9fe585866092cf7ed794ff07576cff SHA-256: d10b2c3e215a4b58c6b9696051db4fd08f750f30e697f9abce8868f70269d19b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload directories, suggesting it functions as a link farm. The document body is heavily obfuscated and appears to be a lure, likely intended to direct users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4873dc0c---xudepub.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/vanukepelefov.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b8b31295---90183231469.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b07adc6b8f11fc8186cca20cdc4a7739/nemunuvitalelul.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515211624673.pdfIn PDF document text
    • http://jucal.es/images/file/dejume.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc075580d9---46163459262.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mcl4p3jfple8ggtnsm3s5vq1c5/vubaj.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62e867e90---nojuzarorid.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c48b636ed---rolamogabevivetuzikom.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1d026312---xoxibufibutibazazel.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7c9d2df270920ef5bb7dbe76225a9f3c/siwidobit.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/h1k18brti6mkm6vgd82luqv0oj/29372279922.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/18870d1c80d18f7c98dfa22b0087ad3c/xanigedomegasen.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072c9384880d---72536595003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=gateway+to+quran+para+8PDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019844.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19844 29060 bytes
SHA-256: 253a1080a26634e059f271ea93bc0ec4a35ddba0c098cd497c1c4156fc3289c9
font_00_sfnt_off00015d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D91 4980 bytes
SHA-256: 714b4273bf59989a3f1abbefa97f09caedc6f003b4244573524bf5fba6f55ef5
font_01_sfnt_off00016ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA9 13784 bytes
SHA-256: 3835953f9d0de12f8cbfbe95101739e0693014b9dada4f8b961fc4da1b3dbbfc
font_03_sfnt_off0001cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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