Malicious PDF — malware analysis report

Static analysis result for SHA-256 4760610ac827f131…

MALICIOUS

PDF

68.2 KB Created: 2021-09-20 21:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3ccc9c614a1f14571465e1c297fa1c6d SHA-1: 459c4fc2d316769c43011e4446776d429b4324fb SHA-256: 4760610ac827f131d2724eac93b2c13e7d64998d734acd8141d4451a98be7265
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document is designed as an image-only lure, typical of phishing campaigns, which redirects users to external URLs. Embedded JavaScript streams are present, suggesting potential for further malicious actions such as downloading additional payloads or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 0 text block(s), carries a click-outward action, and is only 68 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://gapp.fr/medias/files/momedifilipagobuwefak.pdf In PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613584731bc63---jupumeveditorupu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/8063032943.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/68446822325.pdfIn PDF document text
    • https://hinaweb.com/upload/file/mamapozibakefa.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/60145524290.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210917_9EA0EB49BB5C7039.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/dumaniji.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161396dbc9b2be---zixobizomonojatekikejurib.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/22549645927.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/tobewekavotepup.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/49098209935.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/8910685551.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/zarexalesip.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/rimosozibanewepu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/69467598313.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/90855948039.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431d7c462e8---70831699223.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/visedenulafobamon.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30504039263.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/81796634174.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/dedovi.pdfIn PDF document text
    • https://izometal.net/mm/file/gulelefutudosek.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/12683813525.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ed17e972---bazeratofepevirepoworu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+audio+jack+not+workingPDF 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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 10588 bytes
SHA-256: e1a712cab669438757648d319ca6efc4ab75e5ff35a6ec525f95506a9a88ba12
font_02_sfnt_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 13996 bytes
SHA-256: ca5e77047d6abe43c422f55ed6bb88e63936eae33a8c75ac34f4569015c93f73