Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9d9af94bc426e9…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 00:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29ace465d085a42c5566953d25b14971 SHA-1: 2cc03c08fa912e0863f6080137610f4c558bb377 SHA-256: 8a9d9af94bc426e95d8b91ba68f6d0e8646a68f202b923d3c90d8b72044ca8b6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as phishing malware. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adce2443c10---37233362207.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c2d0b735---60935054458.pdf
    • https://ikitellirezistans.com/upload/files/xugagowolifazojaxo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ebe798af---15623984797.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a9647f0bf3f---78129118515.pdf
    • http://libertyquad72.fr/userfiles/file/jadafalunexavetiti.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085296a67c80---zalutox.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6959d4ad0581c0965dcc9bf2efd8638a/zukotusimagikedorolesa.pdf
    • https://semut73.com/contents//files/nuperawekazawevonetes.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079dbc7a0208---64290919393.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/893d56edd553895d89507b2ca9af6cbe/riwubisijunifojugijelevub.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b038948f38---27876439986.pdf
    • http://alnoorcity.com/userfiles/file/74793381497.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607179a8452e1---1774678550.pdf
    • http://eastcoastbiker.de/sites/default/files/file/22973519773.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0219d0de75---nelitajaxekewilaboruduso.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/4af93031c86dcff7f786537544ad390f/zevazuva.pdf
    • http://chalappuram.com/userfiles/file/wevujinazawadojinavajam.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384a277e4e---tokivepevu.pdf
    • http://geose.ru/userfiles/file/38056128155.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qcea00gs96dvqgnq0bbq7i1gau/28136584318.pdf
    • http://araonline.hu/uploads/file/64001630031.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/5d6984eb2ff3b58ed4254a34e34a2522/jojapixakaxixuxedemos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=convection+heat+transfer+pdf
    • 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_off0000f990.bin
b8f349a6d14da17f436492d6f6f6304cc56b976fc2d00e553de50578a73299fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF990 17568 bytes
font_01_sfnt_off00012818.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12818 16792 bytes
font_02_sfnt_off0001402f.bin
ec9425afa5db029646936da305ff834af78546f844f6ea95824e1d4b72814c19
pdf-font-stream PDF embedded font (sfnt) at offset 0x1402F 10768 bytes