Malicious PDF — malware analysis report

Static analysis result for SHA-256 8001d3b1a546a1b0…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 09:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd3048815eb5e4d1a642d5478adcf9f8 SHA-1: e32307b7072772df06a783aefb609a5299b6c9af SHA-256: 8001d3b1a546a1b0a1661f07aa1458a8fac361af2fa92f26d48d497460f7a08f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to direct users to malicious content. The presence of multiple links pointing to compromised WordPress sites and disposable domains, as indicated by the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, strongly suggests an attempt to distribute further malicious payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariosismondi.eu/file/58030594780.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/341ff755ba92af38cd5635407fad005a/lujasedoxabati.pdf
    • https://medtek.vn/storage/file/31179705662.pdf
    • https://victorybear-info.com/userfiles/files/82886800164.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/fr0jal59dd5rl8sq0fcltvdh37/xebepog.pdf
    • http://medica-eg.com/userfiles/file/bimedejajipebunok.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d13de9fa0f---314769921.pdf
    • http://mikailang.net/userfiles/file/20210625095324_284934701.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/17c84225a917563c672290e6d985452b/bizevo.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/o1h9rb91542at17i4c60bu6kme/93636330078.pdf
    • https://seitonsolutions.com/ci/files/29250986687.pdf
    • http://sharon-barron.com/userfiles/files/34137899188.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dc927dd3ca58905e46355ba7a1663b87/wotipewudaju.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4b3dadc7f4b8bd0cf96afc5f0801fcef/51756544454.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160750a65138b3---97080811312.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7b381dcb9c0c6982cf38c67613556fae/samewekafakimanokulelevo.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j334rhbfgs6osk4gjleimf16b8/87356204147.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609090c48e8e6---kimolumefigikumelikotuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=puppy+ate+its+own+poop
    • 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_off0000e99c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 16792 bytes
font_01_sfnt_off000101b3.bin
d85e1aac5d695d26725d26de81dbeffd0da3a73490b7b4a3fc6e445de6db5bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 10400 bytes
font_02_sfnt_off00011981.bin
b70b0305b2f135f20d124ca3475045f65057f6db7ab983d62cba658f55a276ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 16892 bytes