Malicious PDF — malware analysis report

Static analysis result for SHA-256 5260cf9556d0bffc…

MALICIOUS

PDF

83.1 KB Created: 2021-07-04 16:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a407c22c4755da1db6da7dc510d2542 SHA-1: e0313283409b061f0dad46eee0500d3880990fb7 SHA-256: 5260cf9556d0bffcc8b058783c3447e0a2a8985b20756d9178000d2248fe203c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicates maliciousness, and ClamAV also detected it as a phishing trojan. The embedded URLs suggest the document is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://synerhu.ru/uplcv?utm_term=food+for+poor+people PDF link annotation
    • https://ancoraeducacion.com/images/47664993664.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/57376797935.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/46569190795.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c395ebcc67---gituvizonulimej.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadcc17df75---57282793424.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3679ab31c---mefekevifiruvig.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f3e01897---binonejelukoxopula.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/41598766793.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/461e5d5d689688880d55513b925fd6c8/fedokotagudovidudej.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1c207e6e2c98369a64b95445398522b1/lokadolegirejafi.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nukitefeninelokax.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ppl02op4begl20e2s31to6tngr/58283488496.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8b89f2560109e172a484fd282959b243/57184656705.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/47525028126.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/579d19f7153be75ef5ce15a2dad6f6a7/28986158562.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/37hggqo3n7ba63m27p2l7qdt9o/nogurezazazowaderimuxar.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bd04cf1dd---58089650974.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074578155abc---32207710213.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c14679b3594---24289322946.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/61e2c93bb50ac0be3d44d9d0709e2ba3/pejesi.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/58758992777.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/27bttj66naat92i0of6s2a3l91/pirurepereba.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9c6321dc84bcb61858d0b71771fb822c/38273055554.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/40257257102.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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 16844 bytes
SHA-256: e08ff41e905d403833f2ac56029dbfc7edb5bb77074aeda0f6bd904704ea8159
font_01_sfnt_off000111a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B7 9844 bytes
SHA-256: 5a9a8629da1e2ca153ef2e53481f487669bd7a4b510bb17d02cdf2edcd2bdcd5