Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8c12887ba711a0…

MALICIOUS

PDF

79.1 KB Created: 2021-06-21 09:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37235bb391d90487af6358ab114c3d03 SHA-1: ab0dc90ef00d700fdffe057ad708ea32290aea79 SHA-256: 6c8c12887ba711a09ceb41cd175218276f4226a4b5e8780ac6c3ed39f6c60161
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various URLs, some of which are hosted on compromised WordPress sites, under the guise of a 'truck lease agreement template'. The presence of multiple external URIs and the 'SE_INVOICE_LURE' heuristic suggest a phishing or scam attempt designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=truck+lease+agreement+template+south+africa
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8853610e0973dd2cb49507643369675d/16366299577.pdf
    • https://x-software.cz/data/file/19978202046.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bbcacd0c---50075848437.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e93e33394057f242ebbd036c031a59b3/67712663373.pdf
    • http://szpital-sulecin.pl/images/fckfiles/file/zekirubanijajalusovu.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8c46734d1---782244156.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2f49e832ef48ef3d60ef3f2113f35bfe/wewozebununu.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074b324b5dc0---85978481515.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa6f6ed450---vesaguw.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1c6f38a97a76de34011c7095c97d7d8b/xugizix.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33795540bd---telewawide.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9paqnfej9h1vh3jhcejh7ucds0/mizelovixatenojupebuw.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/pubotajizumerilufuraf.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/i938ctuoo1sj528ui48jv35n6s/fafopaxileb.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/655cnvk9s1r6j7taumlnsnko6i/wivigugutabikiwizot.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bi5sm0rekncuvdal3mpnlnnad5/82018522877.pdf
    • https://ferado.vn/userfiles/file/gidirig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6a.bin
ba5b51568038bf2506e7f612e70084027508eeda239e9f5c4c7baee89c9258de
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5324 bytes
font_01_sfnt_off0000fc58.bin
bb66edca6a080686b206ca7095eecccdc314430103c8d784dc212fcfb342a5b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 10700 bytes
font_02_sfnt_off000120f4.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 4324 bytes