Malicious PDF — malware analysis report

Static analysis result for SHA-256 078a74565c86b714…

MALICIOUS

PDF

69.3 KB Created: 2021-06-08 01:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a886abd80fb8014a462b746e8c600a60 SHA-1: e20708912baa0b2eb94fdcc35ae59e537f973c46 SHA-256: 078a74565c86b714aab2a4fbf56624ddb9a5e1c60d011980b023786c704ebe47
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards the document facilitating the download of malicious content or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://wastran.ru/uplcv?utm_term=un+mexicano+mas+pdf+para+descargar+gratis PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065e459009---36583208903.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c9b900e9---53191093838.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a87fd35426b3fbffcb0f5096984de336/sugunifisiguzumev.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/bowenotonopevi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fdbfdae0e6aea7845ea40e551b7e14c4/70025762905.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/17141363973.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4fdd076b5ca9def5e2e275083425e57d/pavosijukoparupivovofinim.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3elrip9rfvoa6ddekocic2ose3/jarerobimapukuki.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/matimiwawaf.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/q2j5n7lt85cksv6rq3pb0hedj2/14347270935.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523070835694753.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889349386---11126674464.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68bcc71c3a---derumofusevupekiwomuronu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608747d3c2855---nakapepukurileku.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2594d0ac9---manumabakovisogivodanowe.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083457ecfbfc---kuvunuxuvav.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16094816615ed1---vitixavirowujegagamera.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9468a9266---vojubebokewunopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5504 bytes
SHA-256: 0fe6f75b2ae4a9aa4519c5f8cc1fa35d8913ae1cb59fb79484c1327a5ac2a876
font_01_sfnt_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 11580 bytes
SHA-256: 1a6dce04e1c975b15543518ebb51fff76dc59de2b1a0bc55c0688cdc85600406