Malicious PDF — malware analysis report

Static analysis result for SHA-256 a445f723a8e81553…

MALICIOUS

PDF

79.3 KB Created: 2021-07-02 19:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6c3f719bd85f64879946b002b7455e98 SHA-1: 493517e83bcb5aa75448c3484ad204753b833f41 SHA-256: a445f723a8e81553ed156d4c611177c3f48e2d86fc255a5a2bbf645485bfe93b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or conduct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://akcjonariusz.com/UserFiles/file/gelokunus.pdf In PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/18131701239.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/uk7cgbra7g9a9gcoatgc7htca7/roxezunewagav.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ee846e8d8949c3d5621b1507e9103c06/75599935836.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30dc445807---87519492337.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/60077237510.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hro1j3eqs8od2vs5vcciu4o9gl/79323212950.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/3646723236.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/26688587007.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/gogezujezukojube.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/zogumanutixolixegoxod.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/853080f73b8fb6163eccda08ad2fd9a2/35776782064.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9dd115485---febeginisinovavifaf.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/21066143244.pdfIn PDF document text
    • http://ucity69.com/clients/861769/File/minirofutozasamamigeluza.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/37961646231.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/28084022179.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/7142174182.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b480daa25ae---mumepezorux.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/fujifidinixew.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/u6a1l8ack8bgd9e2tmdccaspuh/27246223898.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2ktkkc33tijpbqrcnlv9kekuq3/nowefijuwawawogir.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8ac849021cb4919b8a74ea9ab62fc427/tafalivimupolanu.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70bb98fd02---83265604020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=peter+d+riley+checkpoint+science+1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7C 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 10708 bytes
SHA-256: 1556592ca611eec06932680bcdad353d36ccc03ad5c532dd748924dbf522efb0
font_02_sfnt_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 15716 bytes
SHA-256: 2628510b1d51ba397adbc2df921b8679538db9338a7a0c20bad64d139fa495ea
font_03_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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