Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dbb9e8c83f09f9…

MALICIOUS

PDF

88.2 KB Created: 2021-09-06 15:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80b64d5e17a1dd20427e3f8d36dc9eb2 SHA-1: e7f34e356eb55f14f160e544cebc04f2125d5b0b SHA-256: 41dbb9e8c83f09f9f0cf9ddd3ffe0d2036ac18ed407e75be2833b4d6aca24ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wastran.ru/uplcv?utm_term=tintin+pdf+fran%C3%A7ais PDF link annotation
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/tpp81u60f9qj3rurrgclscdgfs/gonulotaxipatafufinu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161132e3582d11---2772659411.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ff367f3f---benak.pdfIn PDF document text
    • http://viorina-deko.com/images/file/32768316250.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/nemagewom.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/66209986343.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f38bbd4fdef---dipopoxufi.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/zubafabeji.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/12900212269.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/sesolowawejugasubix.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a32436da3---nabigutijolonuruwozusap.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb28a488e6---88502989964.pdfIn PDF document text
    • https://memoservicesrl.it/file/17865508802.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1de5bf87---96091624008.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/lujeromomukajajoxujoj.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16102e1ebac00e---28381400701.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_off0000eb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB36 22144 bytes
SHA-256: 5c7fbb42faf7e53cdb32bbec1387259f2bbd3ce9f73ad91ec0fe14eb5284533b
font_01_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 10352 bytes
SHA-256: 2677dd92dc6ad9d3076973a06953500bb76a7aa1c3c4dee1291dacd984a08abb
font_02_sfnt_off00013a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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