Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8286327f70a9433…

MALICIOUS

PDF

69.5 KB Created: 2021-09-02 22:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7a4809262c2fe6e1ab045f1e2ebf9b0 SHA-1: 19d5b1f15bee5e7a3387b14c06dbd97b1d635c8b SHA-256: c8286327f70a9433aeb5cf4772efedd35179b7c1dbff7dfddda5ebc0367ab8ae
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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.
  • 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://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/8836ae079e4386078692f6f8d5cf1895/zemirawogezopapozufopase.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/da765d467465e7b17577f4a3558cc826/nogakubowedubodep.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sedupowiredijoperoresaso.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be314861bfe---nopujadewetopogeje.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/vuseleziwikuroreruwa.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/moxoda.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e2e37fe761e0d76d0962da93a45f8562/judekig.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/menevifezopoxi.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/notededudatugupakufuduxeg.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/zetap.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2c7682e5a611bf7f55403799019bda07/fakewivozojudedurur.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/pawidalujefalapek.pdfIn PDF document text
    • http://furniture83.com/upload/files/xukukanesa.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6df563bd71f1fc6ffb17cf4b58959706/nuvazetugibe.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074176e17367---44361516356.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/xitadurop.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/55187638247.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/75953149599.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/5729696359.pdfIn PDF document text
    • http://fkhd.cz/data/img/83608121210.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/barotodewupajobigiga.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ll3ep5g6smac3m0bvbpg6rvvog/sebimaxivezoluvakijiv.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/16450754276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biblia+devocional+de+estudio+liga+biblica+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_off0000b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 14424 bytes
SHA-256: 7abfef209aaed7b791d314b84e13bb0a2b9eedfaf223024d3ec7330bb24a27ab
font_01_sfnt_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 11052 bytes
SHA-256: a19c404687d3357c35d580b012014f1440f127724c0d02f2e116f2469bea9eba

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