Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f940e7a0dd5a872…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 16:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae5cb1a48900b7b142bd924b9048d400 SHA-1: 5b9b289ff9ea1ec202beb83a48d92b9e1978deab SHA-256: 8f940e7a0dd5a8722749b48a4e9acfd03cd8685ff7b90156473cedd531cdef4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, suggesting an attempt to direct users to malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e49unijdn3fak0tf615o31d4lu/wowosamojeruv.pdf In PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/zikewas.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/saribuniwunewixusurufigij.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a98bc1273---zasebibuwisabixorojino.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6884f0b31315d51152e3e84d95959f87/53091555742.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/56929800599.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100816487f75---levalexosixaxovo.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c4d2a4f78ac89e11f9033a80ffd3682a/bakafaxesapogo.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a30f8bd994975b3f792c2266f5177371/21773346200.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/85242839926.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oov78ueau5m5j3n7flnh37s153/93999197367.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16105e7d5237e2---35517762600.pdfIn PDF document text
    • http://poorclarescork.ie/images/nasuberebe.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/webida.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e273d4b8eb---7206850647.pdfIn PDF document text
    • https://stealthwindow.tw/uploads//files/202108100755561184.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b66656b2---xuwapilop.pdfIn PDF document text
    • https://webmenuplus.com/images/file/matowugobeda.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/16727916138.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/miwujezakugaf.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/babuxaxozotigukaginawo.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/72723921786.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/0jf7p3ja3gks0s55ea3a6q3m02/26325970883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=praise+you+in+the+storm+versePDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10608 bytes
SHA-256: 9760b7a8413e2c6031d5e3c1e0b8c19fe6671f11103b419e8eaa5b398e404567
font_01_sfnt_off0000f51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 17328 bytes
SHA-256: 8b78b9c76b544806d65640d8371a8df5079054e7af30b6757e17d6dbcb48b57d
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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