Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f9b0f698db8254…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 19:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 89eddeada602c1039211e51e2d72b301 SHA-1: 5a05112dc2918b169dbe9b10a9f64bb1a856700f SHA-256: a0f9b0f698db8254831cab48c3de2c5e5d177b03857537e36b1640ba9d155ced
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=android+open+source+photo+editor PDF link annotation
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/56301278638.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/33109741622.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/38930809460.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/nufil.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24295980819.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ec7617cf0---17016647542.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9vh9ncfe63112qfp77s7257df3/28729932792.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/40611723932.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/berixijuxejox.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/rigatigibulap.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/70501480393.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/54609404739.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dih6rrs16um98focif6m81kne0/kujagex.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/82117007168.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/timafozixixezesatiw.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/49716491115.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/duposorumew.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/29300297859.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/lajomudutinigifaroburij.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614710ed999f5---80312494209.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/24679736418.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/49870819603.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/38718956584.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210917_E2F6510D95E7B3AB.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c5c142d352b0d6fa0720c7e90d8c8c6f/54559775748.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16155e24f1f963---wukifojakulivedekowugo.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_off0000b71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71A 16932 bytes
SHA-256: 6b4222eea47041ddc3664de952328fc15f393ba3990287978bd4db3c4683018e
font_01_sfnt_off0000e1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10484 bytes
SHA-256: 9051b246f461111d6c004d0b643881a4234601de80512e47d873b0a7787b0b48

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