Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdcc947728fbcd8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 777199ba62f0baa2bf2699d78db9e0f8 SHA-1: 9f28b678afe8e2fe0882517f519bb27a7835bc1c SHA-256: 8cdcc947728fbcd877a267979891c59612c507aff12a4a5c76c5e256435ba8ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack. The document body was unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e09610e7a38---zozixu.pdf In PDF document text
    • http://cci100.com/clients/57496/File/xowetalagebusiwupigipoje.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/jasakumisuzo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/der7sljaa92h8o51kmj9ruc3n5/botavuremiwubiwovuvij.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cce7fe345d---panebofometiraruzaji.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa437271b---83176721858.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca613e945e---63714020519.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d85758521a---sadejixigo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da381bb2577---xagefepizujimo.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/787e444d9d3a9b2658413f3d5a9b7af4/80145348611.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/368fa7981f77899eebc732cbcbb703de/7019659676.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c8b8d4d20---dobimudopituluwijalexobej.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/golokuji.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hkgquooglrrl9k51k8ri5t0l0i/58398818809.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/73440461209.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/10463349585.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/3752752839.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c176f1746fd5a91613fa1885bbfb905c/gagijefakatubiba.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103332a16feb---zaxeta.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074aace1c913---35862157942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=irrigation+water+management+training+manual+pdfPDF 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_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 17776 bytes
SHA-256: d26ddb16f148bed41e5767bac84043928315c390f89f23189d6e06c0123ff0a8
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 10812 bytes
SHA-256: 1911c36ac9784b2a58ca1e21030786f25bbed1b686e6f506ad64e05fc53fc820

Open this report in the interactive analyzer, or submit your own file for analysis.