Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcb437ba5576d32…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5390df99f0909608980284a2acfa1397 SHA-1: 35227783b561f3235fbc1bd9fead542927568305 SHA-256: 8fcb437ba5576d3249633d4b2c27c74e7aab1e64c2a4a5c14a27998ac1698073
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a multi-stage attack. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ceral.pl/ceral/pliki/file/92385294488.pdf In PDF document text
    • https://alternativecarrepair.com/userfiles/file/26886540799.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ec2d6e2069aec62ac5905eb58d34d3b9/kabugug.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/dec707d30d291e3a1633226fd62eb30d/69768832066.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xikarimivuruti.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62f481174---65989295554.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/doposenuguveragasifowiso.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/xabalubobudunozufisudaj.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zuvujexidozunafanatu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5c8cdedef---25119565527.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732cfd697b8---bixopuroratetefelo.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/961af4606b8f3893f75d9f45f22b7ab8/70792444654.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hc02pdik8bf0vcvtv6so5k73vn/9584144983.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/fsu5prhc0sr64qcqo4tssjo7i6/30401311603.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s4gufbf2sq6v629kpgc1pi3q0s/tuxolomowemokup.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/65725166884.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34c30602d599506a9919bc72726672c2/lejoripedibawed.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a635114907---30624350382.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3984a147894781e14a2744d72df0ba1a/839687244.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f73639485c032d1ceebe8702c46ac32/xojikifulesexifavavogiv.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wekafomozixumipatosisi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160882a8f82ab4---62337409308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=spell+six+in+spanishPDF 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_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 10208 bytes
SHA-256: a63be970b39dc6c26c975d2ff8a59e3f837b61f06fd4293b90da252fecf9996b
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 17864 bytes
SHA-256: 13ff8f0fbfd81fc81d6a96923190d4dc14106c1d4dafc30825d3b0a6af076d7c
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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