Malicious PDF — malware analysis report

Static analysis result for SHA-256 717950f4229aafd2…

MALICIOUS

PDF

94.8 KB Created: 2021-09-01 13:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 359ee92a2a2a12506afa8a92e3e03d44 SHA-1: 02055cecb1d14e90576624c338fd2b23ecaf9ec0 SHA-256: 717950f4229aafd236cf1e47e5d1d16fec826c7536fbce3403d9f142c5098c4b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cinstech-inspect-survey.com/fckeditor_userfiles/file/jijubixodemoposopukot.pdf In PDF document text
    • http://china-spec.ru/userfiles/file/18727600310.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/63684041484.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d0cd56cfa2665a1ab254cd1fd946cdbf/76228275602.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5e3bfabddc9a5526dcca1896d0e435c5/gipujalowoxar.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/wozatagevesurixifijol.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/natiperiwi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089eaebb49d9---nuduwigogunotudibalos.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2d509a9b---77250538321.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5976e29877---97238562313.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/54141443616.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/69280306601.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fa8b1qbs7jkvkrlhuaemuhvvfp/munogolutenoguvaja.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kuxowusokarebugasigilin.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f4791f28d257a59aa749880a1dc2c31f/823693608.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fudewuvasebegiv.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/23587844979.pdfIn PDF document text
    • http://indecomavo.pl/inc/repedamofiwelolos.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/riwopitajusovodukeloz.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72922e4599---fomilisadozofe.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/76d53431c948d5a5de080e24775a27da/lafet.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a799c43876c---xunetajanexukigatida.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d72ccd227---26313388648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+bot+flyPDF 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_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 18320 bytes
SHA-256: ed255fd8dc8445d51544975fb01c723e523ff30cbc5fcfd71552f27ca9480501
font_01_sfnt_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 9900 bytes
SHA-256: aa048622c4f6be161652e5bc109558eca5c27816e848a7363562e0f12cc5c5d1
font_02_sfnt_off0001548c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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