Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4c5fdc7e49085b…

MALICIOUS

PDF

84.4 KB Created: 2021-06-11 18:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcdfb872d6bc4873d57989df0d024bc SHA-1: bdda412238c3536a7a6ee3ac4c1ff6e386066133 SHA-256: be4c5fdc7e49085b3124d96542ad2e1445528ef4b41095c8cf096248b84ed9d6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites. The presence of embedded URLs and the PDF structure suggest it's designed to exploit users by redirecting them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=fath+ul+bari+english
    • http://w-f-l.de/user_img/file/15179251396.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/srfojseklpdqhrlougnbd90i9g/boroja.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071901780a1a---zunizazupoxid.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a46708a3---8616155970.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b058c6baf---jagiziwesanok.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/k1vmn1ub1scmu3mfcts4vh9r45/genida.pdf
    • http://centroolosprato.it/userfiles/files/denijoliva.pdf
    • http://al-bandak.com/userfiles/file/7642699984.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849801c6bee---xurax.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081454654ff1---1737889515.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/092caf2b8cc783f137acce311f8220c4/59727963200.pdf
    • http://techbis.pl/files/file/93422268504.pdf
    • http://iberia-ex.com/images/blog//file/73868156058.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c239b0af1f2---xonalebekuvo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3fm7gjdim2g4rl9mpdj2c72lh5/52569883256.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/533ab6e8f20b10db54f0723fe0df4ce5/jifizisekexorepeduri.pdf
    • http://auksozvynas.lt/userfiles/file/75686982379.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001280b.bin
556dc9717f3df41579a58e4251685466134d2828f4e3fbb03be61c5e1d043c7b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1280B 18416 bytes
font_00_sfnt_off0000e737.bin
d3d59a2de2af5bc988bd903198a0be484f8ed6f92c51e43c65ba22c6defc7739
pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 5040 bytes
font_01_sfnt_off0000f857.bin
b3f5bc64838f6718f86e9d4b82546dd98861b7e641f9fb393bbdfa06cde17e04
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 15588 bytes