Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09cf8e7d7f4db1c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 07:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4905eb90e32584946fb0d469b6c15c6b SHA-1: d8040816db0e155b319ec460d536003d0c6b529f SHA-256: b09cf8e7d7f4db1cf10cd1e234d5abb0c90b42dedaf52da5157c31d292f05e38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The presence of external URIs, including one with a 'forgot_the_phone_password' UTM term, strongly suggests a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=forgot+the+phone+password PDF link annotation
    • http://scamps.biz/userfiles/file/47697944680.pdfIn PDF document text
    • http://flexa.cz/docs/file/49972415831.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/22495842592.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/967ba1f3970192a0fe974351f22c1f12/jomoviserawijajelepo.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/78776648533.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/vimasuzesoperivefoziwupo.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/67217315264.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/26828109466.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/7858998167.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab19524f---dotibobeboxemaker.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/54953778318.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210903_8BECFEC8B9E22163.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/xivawizijixomuwot.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/dovepudotudapoloxajej.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/74260113075.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pijosekowosezazed.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/dufezudoxibojiwuzewoga.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/monoponexixepojebese.pdfIn PDF document text
    • http://talleresjpg.es/img/file/90113594148.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/xudagov.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/rubapuwodo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/lovafinav.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b1aefc0a---wamivikodosejud.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/paduwato.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/voworuwifiradoginenikug.pdfIn PDF document text
    • http://www.w3.org/1999/02/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 10596 bytes
SHA-256: d04a41e1d12d9d05c09b3ffe4f9699607f023433089f303b7fe3943de83acb5c
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 17936 bytes
SHA-256: 9fa0447b85377bc066174f05c82c3d09b7b7eb8ddc0eef4f7fe18fa7265a2969