Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c737ad75269eb…

MALICIOUS

PDF

92.9 KB Created: 2021-09-02 05:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48c3ac6314c97946734d2d17c3ee2a3e SHA-1: c0eb3e79acb66926b0ea748da0495be4c9dda988 SHA-256: 813c737ad75269eb2bab89d7e1c91919044cd113270912145e9d59c5a2fc877c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_URI heuristic specifically points to a URL that appears to be a redirector, likely used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/uplcv?utm_term=fighter+fish+reproduction PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d46db01c9e67c605084280aa8df1acc2/11245475065.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e2v5i566ljt5r0iffkdl6vrufb/15840354444.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/86086935992.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16125928e36894---73173761928.pdfIn PDF document text
    • http://demkapi.com/resimler/files/12069695432.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f038338c005---vugudugididarifexe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b713802805---sonatoxiparezebawiweno.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/82557621510.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123d3ccd2a7e---70193506326.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/64153195896.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/h0u0aafrr9sju3ujplhsad4jm7/benevixaf.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051522237_1046073841.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/solidif.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e0bea4f65147511efc205abc46148c9d/pupebipovurewugava.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/85487444362.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/safumiponobeb.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/ec3bae3cc14a7cc31af193f7eee8f69b/vurebaxurunitepapi.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/fufororasapemukewilun.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965a7195183---87086272228.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/54736909331.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dbb2f53dc2eed3a5fcc40a4a48ad187c/gemikazevef.pdfIn PDF document text
    • https://susta.vn/userfiles/file/40563182573.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/sumosotami.pdfIn PDF document text
    • 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_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10768 bytes
SHA-256: 6d24503a1e87e7b0a4b5a15e04300e5707a888b29eee9ab77361ec3350409e88
font_01_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 17088 bytes
SHA-256: bb893bab6c6847bf1be5fcaff0355366fd0dbedf432edec13e168d0e80f6775a
font_02_sfnt_off00014da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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