Malicious PDF — malware analysis report

Static analysis result for SHA-256 f452e8324af7d7a6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 02:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2850c538b0a803816985d3edc8dbeed SHA-1: 7fa370daa015eba671ea35d0e3b95409ae205e6c SHA-256: f452e8324af7d7a66a2aa9c2f69696ae72eea1760a85aaba1ab44db44a13db5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often with UTM parameters, to potentially lure users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://synerhu.ru/uplcv?utm_term=android+sd+card+data+recovery+software+free+download PDF link annotation
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cf08cbc00619d895422faecf07e97ce5/68237306477.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/94364247289.pdfIn PDF document text
    • http://precisao.org/files/files/19623662896.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/rajamibilugupelemeguzivew.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dixuja.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/rifazorawuz.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/vezokekuw.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/23355186266.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/5912317339.pdfIn PDF document text
    • https://12shio4.com/contents/files/6098636767.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/naxasoza.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/naruwovim.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/51048361191.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7d742a518---bagejabovaxaletoravubimo.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/kazokisifupuno.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gototajipumimepoviminox.pdfIn PDF document text
    • https://suncables.co/images/file/lijiwokamirimikijumi.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588757e4a0---95885871796.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3dd00a23ec3d6cd166fc717d0e9a1085/zajisivum.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/euhiqstb3hilg79tvatsqj8j22/88394486578.pdfIn PDF document text
    • http://agilesolutions.in/uploads/98072903611.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613af96feb201---88166527420.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366f18c07e5---21281929043.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/solaguvufagip.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 17992 bytes
SHA-256: 98980183a3a8cd479649ab3676fd23fe23e5416d076ba79f89a62a7d895b35e9
font_01_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 10716 bytes
SHA-256: 8b101983f67cce5dba4adf24559856b496c2075e8fef63bd9cb6073295b02a57

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