Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7868ef688f331b3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 18:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e07f5511cfa94abbcbc0b892c8cb3628 SHA-1: 51d76586799204760016ce7c166158957badad8e SHA-256: e7868ef688f331b363b8c7e762a0aa11019b96243c7347c3b27c5ab4dee0ed91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to compromised WordPress sites, likely serving as a lure for users to download further malicious content or be redirected to phishing pages. No scripts were extracted, but the presence of external URIs and the compromised CMS upload links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=challenges+and+opportunities+in+international+marketing+pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/20cf369540801845cfea122f92547596/fokedige.pdf
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/xarowidotitosililuxog.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/sj1jll7fehf9c8445ctt6nc5um/jasimon.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4d1db5dd303a0aae2a45822e16743ee9/1044665720.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dc1fc7431---9690111950.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b9c3840a---rezavosinubaxavoguvis.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4648dfa2776c00d5cbf943f1239b3ff6/62574992017.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaf15c6f8f---72688085144.pdf
    • http://skrabl.pl/www/rpbd/fck/file/jalipavavaxonamosumubile.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/53058658195.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160827d0169018---73785777543.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/70917636057.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe8c3c776---40760360437.pdf
    • http://studiomanzella.com/userfiles/files/wufiruwipikalawepujogi.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b675aaafa66bc3612afd5aba0dff1e6c/napakepisadefitomodikadi.pdf
    • https://footballsod.com/images/ck-uploads/files/84425722289.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608234a61c0f4---46452554228.pdf
    • http://cosmoscm.com/contents//files/74420609380.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa54d4d04f---55371850763.pdf
    • http://eko-inwest.eu/upload/file/tovijemokonojokejakomaviv.pdf
    • http://tomaszfilipczak.pl/userfiles/file/wefibipesalowuf.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a04dbdac9---54152322498.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/278345cop174kham37fco1gare/wutovezaxalutuw.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1f1de3e2---vefukibo.pdf
    • http://atenngo.com/admin/sites/site/documents/7528037895.pdf
    • 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_off0000ecd4.bin
f27f253c0f0d7d0953c386da2420ada70d5f1d1fb8270d96ccb6dd11707aef67
pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 16800 bytes
font_01_sfnt_off00011871.bin
b039a192b207e1bfd26507baa64fe16f8ce6c2caa1a94422b4de46a7d59a2b63
pdf-font-stream PDF embedded font (sfnt) at offset 0x11871 11168 bytes
font_02_sfnt_off00013229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13229 16792 bytes