Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dbfac8fd064274…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 18:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c90b858a4f798f7a3cbf6d1e441fa75e SHA-1: dc5b1957ca12e4e920f79e3b7763c9ac1061d76b SHA-256: b7dbfac8fd064274f3194454962cc98d1a3ed607a60ef3e616e1babeba4cb469
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains an embedded JavaScript stream and presents a link farm pointing to various URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. The document's structure, being image-heavy with minimal text and a click-outward action, reinforces its role as a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8118c6e80---82803721994.pdf In PDF document text
    • http://daoltrading.com/userData/board/file/kuxelokekemegimadejude.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74699493146.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/16659255579.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/lupugibaxow.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/69032689034.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/20944693777.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/gejarezimowaneximapanin.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b7677914de2b0a7cc053af7e00cc30bf/16586108504.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/lafotatatofukes.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/fidobozuj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0389bbbd---vedufujasagon.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/39939184932.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5d97faeda0e3e5858750f564329a2486/webogobaderebu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/gudomixu.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/41098215989.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16151f89846537---kuxurokumaruxesir.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/75231511206.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25c08c473---49963767847.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/xurabanorolafozazudevu.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/45021887495.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/29868608978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mini+militia+doodle+army+2+mod+appPDF 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_off0000b0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C5 14232 bytes
SHA-256: d646a6b46873438c1529f8c7e7903ce785f9778e3fc1b264b27bd8430fcb7e58
font_01_sfnt_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 10612 bytes
SHA-256: 83fa9b84276784dde21f25a60cbd7e6af78d92e9fff2cd9ece5e475b0cc96473

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