Malicious PDF — malware analysis report

Static analysis result for SHA-256 a820d9b08b6abb63…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 06:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ef38c70989b2b00fce4eb3ab06d974d SHA-1: 9a2743c35d042e0502996af234b2f954117126f6 SHA-256: a820d9b08b6abb6380affd7aed9d8d5afc6ec1c65f1879743fc2864769d9397c
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. The document's structure as a link farm suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39dc235c1---11610555410.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/019b22432853f9f940a5d30f3577b741/38976270859.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d068006d45---feved.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962f1c9492---votuwodese.pdf
    • https://a2designbg.com/userfiles/file/nafumafif.pdf
    • http://akssert.com/userfiles/files/16606348392.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1e17992942e7096cb7f05bda82e8f851/lavifab.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733f366342b---16172312402.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02e687ae6f1b878a70234241dbd7489e/bimobigalegewodufabunas.pdf
    • http://bobas24.pl/Upload/file/lujomoxeve.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d293dbd6---levuwefatafubifotesuwo.pdf
    • http://www.companyforte.com/imagenes/editor/file/bufavaveti.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4d34120c7fd46b6e40e89f5be8ee95c/12485844851.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/pfe7n5383023d8ntf9e7pvpgs8/90942624469.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/34oltqsja7hgu518aglkueg9c3/moxozimuvixefazukenusunij.pdf
    • https://vivekanandbawwa.com/userfiles/file/49110190602.pdf
    • http://mevlanaasm.com/resimler/files/21415664090.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608439ae26956---gafagu.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sgtlmpc176cdm7pjsj8v8tlni4/zememise.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9ec6c8201---buturuwudilotujorowus.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf84747327---savimusijarekideriwezub.pdf
    • http://greenbrier101.com/userimages/15230215099.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed8d7beb22---56743796417.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=brittany+hunting+dog
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70e.bin
5106d529dcb27d3b1aaacb1b78036a8a5e8573cd5ec57a5ee40b3c2f2671cc39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 17968 bytes
font_01_sfnt_off00012644.bin
675407c1b248b9b1a0052afaaae8f9153825e789cb4c78ddd05a316c203a8544
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 10448 bytes
font_02_sfnt_off00013db7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB7 16792 bytes