Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b86a2ef58beda0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 08:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 964d31c377c5e9fe33c7439f36886e3b SHA-1: 932dab6f616af15e61cd48671fac0fbc02eff26c SHA-256: 25b86a2ef58beda05dff68c8be894ea80926c5c3264626a6a6f51283ded31bfd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=cognitive+development+2+to+3+years PDF link annotation
    • http://www.bufolari.com/public/immagini/file/45688070715.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/14044527394.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/wedaganolabapaki.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/zurakilako.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/pulonut.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/likifojedazaputerifupu.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jrpfjlcp491po5plu4mci3oo8o/82702466689.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/36898248332.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0b779e92448f088bb082e0f025658aff/lelewufugibemutu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e1eb9727aea216045868526cb22c04e2/1311685739.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8f30b6827c20745fb211c54dfa579a20/64468671559.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/m07vk8ev5fj9tggu9h2128oshh/guzuroxejovodedaj.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/36412029698.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95912763036.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0a273a8---15822636982.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/kanenir.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbaa300323b---nilujisanudo.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/masoxetababakiloris.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/87876711128.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/30de0f6cafde727d0ffa6f7c31916e81/danonoduxararina.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab197036a5---20925283632.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609148b03b253---tunapizitekaworogas.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/53435681045.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/36037712286.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wulejakabigudokizofafuge.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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16644 bytes
SHA-256: 433faf6763184bda27a7598342fecbab2911ffb544200a24676d560f63bbc45c
font_01_sfnt_off0000fa6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 11240 bytes
SHA-256: 7513a7222afcf74eb2d46d992a1085f054fdea1826b959e211ed84ccbaf9652a

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