Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c8a427fbe44fc…

MALICIOUS

PDF

83.0 KB Created: 2021-08-16 21:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99dea7a883697893947be72df268d147 SHA-1: 374dfb21aad1bdb8eb95d7173907ea5328bd7013 SHA-256: 9a9c8a427fbe44fc7f81af5eb4e1bb39fce7cb72c1be091b83ff15c99997777b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document containing links to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URIs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d16438d6---46119701948.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cae66c992f4---sesoxodilixibo.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6877b524f2780585251c153d5cc39965/bajevasexitofajiguweno.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/70350892686.pdfIn PDF document text
    • https://salonrewards.ca/images/file/fibejulat.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/7km4p7h8c2ta5v6p97bovkren4/92752897541.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2799fab69105333d8d907b0cb8c4761b/75863113332.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/wevoj.pdfPDF link annotation
    • http://pc75.net/upfiles/file/1621348354.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e360bba684---zipexa.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/58731260996.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94813a733---6277013886.pdfIn PDF document text
    • https://castel.ro/userfiles/file/tofavesidubemitasu.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/23177506226.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0407c9e472c3ad4f0ed14c7566834227/wujowefedon.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/60002936672.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dae6c905---62730029555.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/musofomufugelobivabezixig.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/puzevagapalibivoletavi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6be58bd32---vemomoxejomesomole.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609201be34e64---delukibokuxupoxavaporesex.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pazegadafutebovisubu.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6a4u5teuof76va1p2nfqcg7sp5/kagamenozixexafuvewerudi.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/jesavume.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/dazekukeminogemex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=despicable+me+1+full+movie+online+free+dailymotionPDF 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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16292 bytes
SHA-256: dbdb07e87aa7d9144347f25d39211df903c12910326ddbed74bbff3f72d2d41d
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 11256 bytes
SHA-256: fa8e8bb4201c4654e931e81e9f42595caa8525f57815729765849899cb7eb21f