Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c49774df40938…

MALICIOUS

PDF

92.1 KB Created: 2021-09-01 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42c3f9d9b29e64c022abc4e6e3ff2632 SHA-1: 89bb7e34ed1bd2d0496e84ef8c786f1176189206 SHA-256: a80c49774df40938ee18947c214d95ca4fea1c9b2fd2e18e14aa90ca5a964106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d1d24cc8---vojimuzuminugodunabixajib.pdf In PDF document text
    • http://slsnn.ru/content/files/90578642588.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/sisudosokosolipax.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ca23e2765b---89717975953.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/zokinuzazifaviratibivufob.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f8b965e6---ravizolugud.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dusaga.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/9663114776.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/74083408253.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e4325839c---59439032989.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/21374262417.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/14254929547.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/vukupisezubukofivanixa.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/bezisagumitapupubelag.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121992206b8b---26747778609.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608752d9b09b7---99052438514.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/24139906369.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c097b3367---58907033213.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/somovewuwapofavofemuwuta.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/d140ba0d8eeff48d6669b69b0a46e443/94020833375.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/keroragepupafewu.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/molezumemuxajimesupuvenov.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/adb6dc3d335c6ab0cf1eef18e3a62ca1/51676713211.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6e135d71df4a5bd3272477f1632074bd/78331522733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=great+danes+of+the+ozarksPDF 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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 19444 bytes
SHA-256: 204d4a27e6a9a4efd425e6cac328865d247bdd21996de646485b3a4b4ed7eb05
font_02_sfnt_off000149f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F8 10504 bytes
SHA-256: 04f6ceaf246a06e139d782b952575b55299a30b6d4666778b28e29bee3a6859f