Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a5e173f061f8b3…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 14:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 745bd8f468114f39bad8d07a99aa9410 SHA-1: 3830e9d202755a9c4d108de1aecb417388abd2b3 SHA-256: 47a5e173f061f8b34150089fb2702e14cf00f33f63461e58f7345a6ca97f5190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c739dca1f7---ralujavumobapatesudavazez.pdf In PDF document text
    • https://powermailer.in/userfiles/file/75699543434.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0aef07a449b7b992c9668f67c8dbed8e/dewudibokotekasuwufere.pdfIn PDF document text
    • http://perrymanreunion.com/clients/f/f8/f8644f0eb9578147d5589f75b8c3e300/File/99450402592.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/842634c072854d894c94e19cdd2c2107/15475322092.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086c04a84a70---suwupilavapujufatak.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/32affe3bfce4d0633014def0a2576103/zovof.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3ab5fda7d9b22846eba6a9c285aea0f9/jovedotenoxivufujimefito.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089597928c99---mabozenijepiwekogiv.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/38417780686.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a9f97cd1---52890505012.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/wiwafutexukivukaxonod.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ec51cb23a4da747a2c6851ebf56282ea/14573572513.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/91e2676ff6b96f81aa61a2ca4ce52108/zafesosepawutoza.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/727cbbfc078b82d183176daf0953cb11/97047428099.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bced7912---vezopuze.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/rifafufuzimorarugadoxazaf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607591ba12243---busenubomosiwobimofadidi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/rivitug.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/28645656779.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9a35c3977630b6f94fadd78bf22c4608/kulikozozovazutok.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa26724341---ripuxumelokobigasa.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969754304b1---retotozamevanamunugerep.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/kotebutaji.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898acca1d42---90852660786.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gpjpseihnm9ev8kuglir8dvsa1/24459538558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=employer+counter+offer+after+resignationPDF link annotation
    • 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_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 16596 bytes
SHA-256: b2d56c795f062b47c0e56db36582ff589696a941eff079d69e23b60080205574
font_01_sfnt_off000118f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001310c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310C 11020 bytes
SHA-256: 7f2d393f4f2126b7b5847e6f815cfce6e2e98298bdef1823180b13854efa79b1