Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c167a27fe0d1785…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 10:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e6a278c038d5fb4bec3277957692f8f6 SHA-1: 12942af4cc896eb892baed54d0353350e09e437d SHA-256: 2c167a27fe0d1785e420c1642e455662e0104d29401f4ca0577362cbab76e4ba
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of a 'download button' lure and a callback lure suggests an attempt to trick the user into downloading a payload or engaging with a scammer. The URLs likely serve as entry points for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=fast+and+furious+7+123mkv PDF link annotation
    • https://sokolzgierz.pl/web/uploads/files/27365276520.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/zewilozaw.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/nefafatifori.pdfIn PDF document text
    • http://c-six.it/userfiles/files/sokudat.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/35822495150.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9115a8e97---38770416222.pdfIn PDF document text
    • https://servauto.fr/img/user/file/16457475131.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133920ad3c71---55256001315.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/trtlrlbj585u0a503vfuo1hji7/39338863865.pdfIn PDF document text
    • http://dasbluemchen.com/35680322967.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/8741265963.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/feveguzufokidafoje.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jififedudoxekoxexigola.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/metuzuvodi.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/gebinaxazemunawakaxo.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/tabakitewimivizit.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fanukuboxuvegarodirezafan.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161441425cdfec---zedasoduvow.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/wokukibiwine.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/94797862676.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/1426206887.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/10675178538.pdfIn PDF document text
    • http://jainfarms.com/uploads/libinomokimotidexuze.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/39476614281.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/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_off0000bc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC74 16796 bytes
SHA-256: 50487aa27443ed88ca1eaeee03c4b306a1850a39af7ccbd19cd4e5205393f23d
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 10968 bytes
SHA-256: 1fa55511f9492db0b5cf0c63e4a7acfa5db70ea70ab574acd261a79f68a27c5d
font_02_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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