Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1f7a680974a46d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 00:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ba2a6054ad205125c045d2afdef9781 SHA-1: e609cbdfffbfdcd59a2050c3da421cf9ba3371c4 SHA-256: bf1f7a680974a46d9c1fb61a25d9d3eae876ce339cb5933f868debd82f1ae3c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple disposable hosting sites, a common technique for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixel.bg/img/file/fubizafumedamuroguka.pdf In PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/20232249010.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/makana.pdfIn PDF document text
    • http://spbi.cz/res/file/newijofurirose.pdfIn PDF document text
    • https://dm288.rs/slicice/file/davamigujanatarolu.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/29000856587.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/5439814192.pdfIn PDF document text
    • http://zimmerei-possert.at/50333065884.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460dc61f9f8---35823140751.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/65729847609.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a314db09a---80379970915.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/tobalivenexetebujamepogo.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/16819898956.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/vatemasejar.pdfIn PDF document text
    • http://riviera.az/userfiles/file/62333728398.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/gewetapugakalobese.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/viberosavejoxeru.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/3017384009.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109030804427992.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/bisujozif.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tuxikijuzizugutazoserew.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/13786103191.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/545j9alb6ro3bp4v84llqpfrvi/povebozajezomimadek.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/wurudubekekufuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+ullu+web+series+onlinePDF 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_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10644 bytes
SHA-256: 120c820cb72fdcdeab93cbb2f69e008f8f2eb5cf897d9890fe2588638fdafbd9
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 17960 bytes
SHA-256: 64d65ae4e60d1f5903f2807532a19b044cadd79bd4fd76d7ab0e59a13f1aa7f2