Malicious PDF — malware analysis report

Static analysis result for SHA-256 0813368edef5ecde…

MALICIOUS

PDF

94.9 KB Created: 2021-06-10 06:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 09910e27dc915cc3467fed5c5c288e5f SHA-1: 2e43baca01a6f7c1f09669901e30999f7fcf363c SHA-256: 0813368edef5ecdefdc03e3ac0f5f9ae644d823cee32f2002dde598f37911d97
156 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of a URL with 'download messenger old version apk' suggests a lure for users seeking software, likely leading to malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://drafthe.ru/uplcv?utm_term=download+messenger+old+version+apk PDF link annotation
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/21645a708c4728104fb7e65022e9b161/29819223438.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dazerofojegejopovanaweg.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/485c24c401edb1c09ccb0919ac467a84/fixunaxurezidesabewixevod.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2c1de0ffccbdf79beb8d650f008ed824/59176062021.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075215883e25---xerufino.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/fujezasebodedupij.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/92201131693.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7aadeb22466d29d87b95c7bd7efa84d2/saxomaresubepuniwogediri.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/46569188421.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/talan.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/43894994056.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ce81d7d9---83089286618.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/7qi377tq960cs64u2l2gr94b1c/99060029902.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98880737686.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5b2f7c3---9390430801.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
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013a96.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13A96 21472 bytes
SHA-256: b2fe731964914db62922c9d340910960b9a7a7b60439015ee2d1a0fdb5bc7772
font_00_sfnt_off0000f148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF148 5204 bytes
SHA-256: bb9b28e1af8963a4219e1e26616a7fa875545e4262e6739cc7f1471af679de4f
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 3340 bytes
SHA-256: 4d9c4c12dca24cfac8bd71410f99fae4e375e28988f8b275e96c6c69e792d344
font_02_sfnt_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 12384 bytes
SHA-256: b3d96c8ac307f73acc50bdef8b4d8463f31d24f535fe06f841e730d8a2ae2563
font_04_sfnt_off00015f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F4A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230