Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd4b78eab601c88…

MALICIOUS

PDF

92.4 KB Created: 2021-07-16 07:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a461276d8aba2e2e46d114c2db14f8d3 SHA-1: 6d5864ca2525d129df45b2752096d5622f1b3d62 SHA-256: 9dd4b78eab601c884d39917b7540604f1226ce2407d36b41c95dee5e2b41ebcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to distribute further malicious content. The embedded URLs and the overall structure suggest an attempt to trick users into downloading malicious PDFs under the guise of legitimate resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://archism.ru/uplcv?utm_term=pdf+textbook+download+sites PDF link annotation
    • https://arab-hams.com/Ups/files/wujapekebutajil.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jovemi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8f7ca268---xisorevofowid.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989472234b5---podelunavozox.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2ba75f415853ff64cb614d7b5a25f8b7/86413798638.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4930652d---nojasanupijumikis.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e363e8e7e---23568832386.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c6232b1f6---41111675270.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7c58b8883606db4c37ef30c735be9d05/10247310795.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520103134179707.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/85053458430.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/96261415727.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/95781894032.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/zukutaxowuza.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/faxuketukawasomevubujute.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rgblahvvi8tfa6hoaem4qnrcab/lixosedivizuwimutawizuti.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/5886903870.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/97297251179.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/saxedawajiviwag.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8m8inrp9lau1o050laqgd9c2bp/48994776405.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/29146937687.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c24ca7bf---roweradajomolad.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16098af4978ce1---runezeraketamulajizasif.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/84fb6ca3c6adb0debeb5a36427964338/38210041425.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b35c74b9c---nazororelis.pdfIn PDF document text
    • 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_off000106ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 10668 bytes
SHA-256: 7e154b870c3008080fad41135389524f6ec9eca2598e99f642e42998b795a0e3
font_02_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 17012 bytes
SHA-256: ac0a7485c73de699337e01a3066dab4ea7f70256bd54c7fe39992b8846dd7ba9

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