Malicious PDF — malware analysis report

Static analysis result for SHA-256 907ada0e703d67ec…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 08:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5db8259b0441477807cd4346f1f9a273 SHA-1: b3ed0e2a6a51ad2d3b7a8c4a8e03b2e282e60557 SHA-256: 907ada0e703d67ec3f2d6a559fee87ea49f54d95d6457e4cf3f05126d5850725
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rotang.net/userfiles/file/54055645081.pdf
    • http://hyunshin.net/userfiles/file/fevinuduwifinojovakadim.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4p4csu97ctg1fe7ocn83ja0oo2/vejuxibeforijejeradumaro.pdf
    • https://casadko.fr/userfiles/file/46049674376.pdf
    • http://stroyvodservice.ru/upload/File/69463935470.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/pigebunir.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/65319973511.pdf
    • http://whuntex.ru/userfiles/file/buled.pdf
    • http://ijdssymposium.eu/upload/xipusifitekotoj.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140490e613cb---42959200161.pdf
    • http://iccarrentals.com/files/file/54505443070.pdf
    • https://bazab.ru/ckfinder/userfiles/files/jolafedosiguvirataved.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/92094707758.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/fedesovifidokawodabuzotu.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/xegikobowefoselidub.pdf
    • https://alperbehang.nl/userfiles/file/satipimelirowogum.pdf
    • http://kryotherapie.net/neu/userfiles/file/bewexokunajifowiwin.pdf
    • http://shahgrp.com/uploads/47230897591.pdf
    • http://domki-kopalino.pl/pliki/gurijepojifetikatofe.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430c23320e6---12151990777.pdf
    • http://newworldss.com/uploads/file/84976547920.pdf
    • http://harc-ias.vn/Images_upload/files/mifazuwo.pdf
    • https://holcom-solar.com/webroot/img/files/fejenamewijejiles.pdf
    • http://www.bash.cl/media/file/gifuwuro.pdf
    • http://consol.hu/images/uploadedimages/file/fawoke.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=final+fantasy+3+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c356.bin
735bf356e6526e3edca9f186a5010990cd95d1e18811c97097dd3a752a15c631
pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 17104 bytes
font_01_sfnt_off0000efb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB8 16792 bytes
font_02_sfnt_off000107cf.bin
f309e19042ce3e0bff24021e755a51f72c7b1f16d7744d50cffc8031459a938e
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 10504 bytes