Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9b5eccfece7f74…

MALICIOUS

PDF

85.1 KB Created: 2021-09-13 03:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 171eb2e06fb4f5686ddd9be03c8c6bf8 SHA-1: 75fbcc79db4360a58f10e71d4f70c00d6881f15f SHA-256: cf9b5eccfece7f7464703fb212e7895ad15a9f2b55b8e9b353cc14c37f2cd9e0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically-generated URLs and points to compromised WordPress upload storage. The PDF structure suggests it acts as a link farm, directing users to potentially malicious PDF files hosted on various domains, some of which appear to be disposable or compromised. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/butegoleluninifigemefadut.pdf In PDF document text
    • http://exito-opakowania.pl/userfiles/file/54060202166.pdfIn PDF document text
    • http://telektrans.hu/editor_up/xofemegozela.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mogeduxivaxutuzituvaw.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96593857798.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/45234525151.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/befafikabevaw.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/40922518479.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/xufadagugopasuru.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/93386531269.pdfIn PDF document text
    • http://519pf.com/userfiles/files/kasujupitodajagufi.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/65688411206.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/47410883778.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/14859839434.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/rogipozuzexevufibaziti.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/44390832967.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b0860d5f9---44150597594.pdfIn PDF document text
    • http://yoron.net/up/files/72311360796.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/78301618981.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/rulisasinevovinoposa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e235ddeb5f---17262911442.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/nixumumezarixudakaxaxa.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/35063912773.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/288b51b23f885c77ed0becd5598fa012/remil.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/wixekuriruvekuzajari.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=best+free+offline+android+games+2018PDF 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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 11252 bytes
SHA-256: 67362738bae9e5a57e6ccd2c11b2655f1b79f0f70d5e86e71e414aeb7fbbf075
font_02_sfnt_off00011986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11986 17472 bytes
SHA-256: 3bf9afc3eb0e855120631dc21f79c14ac1ade4d87dee278220a3ee76f713b2f9

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