Malicious PDF — malware analysis report

Static analysis result for SHA-256 901d493857ae0c0e…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 18:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 74d44ea9324f408a76bbdbd4d5675458 SHA-1: c95d2be0e5ae39746d68c76b820f8687fc1355da SHA-256: 901d493857ae0c0ec94407837c4ae19112f1b852dc9a1f17b111de215cc6fe50
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites using the Formcraft plugin for file uploads. This suggests the PDF is designed as a link farm, potentially for SEO manipulation or to host phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904f323cf24---66757262953.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161096bce2fd41---9876816585.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/04e80913ec13e3c346d4306028ee9918/xipubijodetorikefoguginam.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a0d128e71---segufuxuburedemuwukuwa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e66fdb6f1---21774020502.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/pidom.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/sufikemofewofu.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/fozusow.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/44fe76b652acf42f716c0780f44081f7/lenona.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e090c72de2b51df1ebfc320a851149ee/wolavuxipimi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/3nr516as3fsd08ihip9aiba5fe/murasimedotawifipinav.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/22423678002.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/52162980648.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/48c14ac895c55116ec90b8f3c93cc193/54239838717.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/022b0343f29589dd2741dbc2db9665a7/28878101726.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be191a8922---39722685247.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/41846236348.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/26719188164.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/31305012518.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210615233233_y8rdtt.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/rilefepugakirusi.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/dewewomuwag.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/di74ctg0q2jsb0aamrotg3unkk/dafagilifepufebumoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=suryadevara+telugu+novels+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 11020 bytes
SHA-256: c7a3518cb36661cd728b25bf35aaca1941a5f1ae1d9f249000a0955b3225e3ae
font_01_sfnt_off0001077e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F90 17164 bytes
SHA-256: 64544c12e1f930159d4b2e158c532311c1ce1f3c4a5ca1d14351112d4b26a106

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