Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a3e8f70aa3a2b3…

MALICIOUS

PDF

76.3 KB Created: 2021-08-23 06:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eee7537ba1b68bf764a5937b3688e4a8 SHA-1: 3fe8c677095d7348af4cd486b9339df103bcfd78 SHA-256: 33a3e8f70aa3a2b31f9ac41b03dbbb8872ac38a768e3d73076eceea52795f4e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • 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 http://shinies.ru/img/lib/file/95100184485.pdf In PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078397ce38f9---11375049962.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v2vq31vr709sb8chr6nqurabuq/mobek.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/g3h9cvu55edf16otvkbdj0an3f/53881015761.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/gamoladiritikuxunu.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/8857527171.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5cb528df---75036417711.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/32693393463.pdfIn PDF document text
    • http://npas.ru/pic/file/69130342915.pdfIn PDF document text
    • https://wecareprogram.org/images/file/47865774060.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/1304222077.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/48652bc033cffa301690c81165ffb80b/643335350.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/noxesaketumu.pdfIn PDF document text
    • https://baglab.pl/galeria/file/lupufebuxogif.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e423c47f---jijifujixovep.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/doxivojujaniw.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/32896089258.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/jilujutujomosigizumunifaj.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mpas2q6gsqphuuei6ve0ei777o/jupopuzopuvatubozidubas.pdfIn PDF document text
    • https://marigabung.com/contents//files/59340702916.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/67290643359.pdfIn PDF document text
    • https://eclearusa.com/images/file/82090430087.pdfIn PDF document text
    • http://allycatering.com/userfiles/59356351891.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///wakonomakeredafovaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=microsoft+office+2007+activation+key+generatorPDF link annotation
    • 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_off0000ce14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE14 16208 bytes
SHA-256: 941f846f42de93470f3850d2eaa0944da699c2d4dfe41134f05edada8a13463c
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 11024 bytes
SHA-256: b8914833930f2a40c84e13524eaf55f66f9a65e11c197209a466447ed80a5312
font_02_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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