Malicious PDF — malware analysis report

Static analysis result for SHA-256 9046de3b7c693bdd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 19:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f48b2cf640702909a6ff2bd9fc8df928 SHA-1: 6a4418f943680a5ac314ccd4d4b7852b956f39d5 SHA-256: 9046de3b7c693bddb525b77238a5ef068aa0fea8c68fcfaf95c63190bca8f407
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic further supports the use of compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reginahajo.hu/_user/file/punarari.pdf In PDF document text
    • http://angarakshaksecurity.com/userfiles/file/noxakibubupovis.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/degiru.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332f3506e51---35413642649.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/45153062032.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/dotoliwatogu.pdfIn PDF document text
    • http://kalikraft.com/images/file/xesowepif.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132050c18a---38943575089.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/33565397911.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/natijokifibojejegejujila.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/96398750955.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/48671940100.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/27192294426.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/20135731274.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/66021198952.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79543a0dfdbb61bd51cec370dbfc9539/funegezubipedunal.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/57354171766.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/kamakuzexalet.pdfIn PDF document text
    • https://atlantidegattico.it/file/sevijubejazup.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/filuwerafetided.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613679904db8d---miderovigiwuvawazubesixol.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/badugupijafijulojefu.pdfIn PDF document text
    • https://ms02bet.com/contents/files/dixor.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/25542816740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hacker+news+android+appPDF 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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 18116 bytes
SHA-256: a403b0163284310396023fc91b55b8bf25796618149f6aba595d473e38f7fee0
font_02_sfnt_off000130e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E1 10532 bytes
SHA-256: fb25885178b4b510c96f92080b1129172e575d4929c06bc5529bbc9ece8f4f21

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