Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77ce06afd77090e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 15:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48a61cdd297fc736d8dec3952c1e048a SHA-1: 96dfccf3ca9c50d2d7fa0f2c8aee1944634a2006 SHA-256: d77ce06afd77090ec9de011234cbfe67ea2de8e34d946952aad4c8168d301756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of external URI heuristics and link farm indicators strongly suggests a malicious intent to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dad281aff---74375484352.pdf In PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/0ruv2fbbv1vqplk0v6a1ntvvem/sexadofajewu.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9fb26442aeacc0ed29288ea68fd350db/pupofonotinerumibejiruwe.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/57944460468.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jedimaxofozomokevageje.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce4132486---98881167671.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/nebevixo.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/28876452412.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/rugakekosa.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/b12cce29d5bc3162fd15c98d1c2bfeac/10144123133.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126039c9107c---87367149437.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/litadi.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797e2ed249e---77601980240.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/97273381362.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/viponevebezavazev.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac57f141ce9---26996108522.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/62870624008.pdfIn PDF document text
    • https://activepymes.com/pub/file/9412589817.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/2b781e5adec38395f9af4e3bb7c48bc0/lonukesikomirexit.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f583b4e1689848c511de8fb733daed70/fugatok.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tjok3jjv2j9t78mpt3pqo30uac/jusudazoxozowisiteva.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/73653465283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+de+metodos+de+analise+microbiologica+de+alimentos+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_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 20244 bytes
SHA-256: 3200184f75e94ad084946a0e8f2760ee518375d0a33ea5945c5b07865eb8be57
font_01_sfnt_off00010c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 11196 bytes
SHA-256: 12bac1cd05b7fcd1f13e9a809afd3cd53bace87b3a1399b6c8bd6434a77671cf

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