Malicious PDF — malware analysis report

Static analysis result for SHA-256 2922632859abe637…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 23:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5a7844b7ccb778f95da73de3cfd62bf SHA-1: ec7ee16ba946e0e6e48aaa0e2d1eba1ecc7697ea SHA-256: 2922632859abe6377fec27b1906e6415a76e044710d726a8cff018148706f1f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078c2c62f9a---mapurot.pdf In PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0lbbfvfqc7cn08ignc7pvrl4k3/wezewuwubeluzi.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/tirazepogoxok.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/25856808103.pdfIn PDF document text
    • http://trevorhannant.com/6601846307.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/41755933809.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/47100343900.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/49555231453.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/91206320224.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30255cf36---bagifatored.pdfIn PDF document text
    • https://allianztc.ro/files/file/26888478096.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4ba2849f1---33589821571.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/vejubeju.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089fe18e7c51---dowezimodinetopupol.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210812044410.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/22fe2f1fa75a01fccc7f87d19f1e8a22/ruduvupodotevadomege.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/rakozuxalikixoniwu.pdfIn PDF document text
    • http://zzweien.com/d/files/jogewogagoba.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/35794083477.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/700123d469e98b0aa13bd4da65a28df9/jukepidimolidilatofusisa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6d2e18ed97ddc076f129f0eda37f37a5/dafekorojadupite.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9c3cf2f4f7f2e251e55aa2d20812e63a/20637099468.pdfIn PDF document text
    • http://camwater.org/media/files/jokixawumajenunusa.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6c50207139e3004eaf20c0a37a2505ae/77517523410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=los+demonios+fiodor+dostoievski+pdfPDF 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_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 10568 bytes
SHA-256: 269c9da196a841724ec292da9cc4ce2b325103db3829ccffde6051b7e73b3d94
font_01_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 19428 bytes
SHA-256: e73ea528cb606c159120f765ba254538213bafa6ac7b2f02d2e211a56fcc64df
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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