Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32a4379ae1d3b11…

MALICIOUS

PDF

70.2 KB Created: 2021-06-23 14:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 204af1b6b04a3950c9e3b409183fdd77 SHA-1: 650e609b5156a95f2552f49b68128d69b5ab676d SHA-256: c32a4379ae1d3b1116be61a9360f6606ebfde18663bb164879969be841ccc85b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. The embedded URLs, such as https://medvor.ru/uplcv?utm_term=retropie+image+with+roms+16gb, are likely used to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://medvor.ru/uplcv?utm_term=retropie+image+with+roms+16gb PDF link annotation
    • http://mtecommerce.it/public/news/file/7254988036.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f07bee995---timewal.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/50b779d1cb6d6dc6311eeb61ff36942e/30761968000.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078163d9a1f5---kitovejexubunibikuroxejod.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/bd3f269a82487df77feeeb677798d17a/remunenodut.pdfIn PDF document text
    • https://susta.vn/userfiles/file/bilus.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef08a0cab6---budukaponolagedulo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/72e6a84d67ba6e09f2d4eaab70e5e36c/fagakugazekoxuderem.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ejnhssamd0hidpcshdkv24ul7d/13475566079.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/rakekawovew.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/58358278824.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/pipejojawakinur.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/97568387788.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c976570b74---nijazumenusegix.pdfIn PDF document text
    • https://sy-tech.eu/file/68246279600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 5644 bytes
SHA-256: 5ba7474432519ba5c6d2629644979fb328b9f47734a6899e7ab558427de9a635
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 11568 bytes
SHA-256: 9a54d1add32dd7aeeaa3c269c4c416e9d8dd76e2eced33b80f793994a7f38969

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