Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6b98b8a440550d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-29 20:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea003a00207e14ea41ae06bcada0d285 SHA-1: 077a7a63c6fc5a8481091ef07fa8e2cf8cd34388 SHA-256: 7f6b98b8a440550def8bb84f436f7bd0f2bd6628056f4c24283e7819a59f2d7e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/b0300cf23142cdc1775ea59b5bf7ae8e/86636465745.pdf In PDF document text
    • https://woodfur.in/userfiles/file/bimusof.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/rokosugawunoguvigunoj.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/gumix.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/kaweronat.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tijewivukosagurogilatu.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b4b45f6b46912ad7439d9d3e03cd4850/34325907041.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/zileg.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dc1449f19---60384073418.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/dd8213b8740ae7f81428efd739a305a0/lizotagukewopewo.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/dqdruprmgvkdp860tbtqkri62o/37821055566.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/vm8irkvqnun8d9ukfchpl4amd3/zadatudimivesu.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/31745071387.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/11155213646.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/pafejefo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999671b96c8---bakazigigolat.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/ecaf81d09ab4ca1258484bdbb0a4aef1/60942326643.pdfIn PDF document text
    • http://m2m2design.com/userfiles/45017499870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f44b9fe7---xebesadirema.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/70946218966.pdfIn PDF document text
    • http://abnicum.com/files/file/lalawudazujoka.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/7838921777.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5da08f90a88651585f81a90e2cbb06db/pefobokufaxofajawiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=63th+bpsc+mains+question+paper+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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 18740 bytes
SHA-256: 2f5e7b175a9a05230fbe4fead96fb1bad6e3c64a1344169069754e2596bdc17c
font_02_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 11468 bytes
SHA-256: c938912c018fa4279f99c7cd2adcdd254e0e0521857698db6390a7c98d24a0d1

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