Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79bdaa925de1027…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 02:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca8e06fc0b581c9efd317159a17983df SHA-1: 322233c3760101287ada14b42640bc432579cb39 SHA-256: a79bdaa925de1027ddf5cb022525d5a53cfe5b62a566bc513cf4360e43e7b752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure users through deceptive means, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://markmont.eu/editor_uploads/system/files/71484989792.pdf In PDF document text
    • https://motoquadro.de/userfiles/file/55870436716.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/21188511639.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/difunawududapufemexebute.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/92701687709.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/golupojaxugepoto.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414349a6105---85065805930.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/mesavosivisolumakoxazuxum.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/zaxikalixaretozaka.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/23103860132.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/buguxebu.pdfIn PDF document text
    • http://abwva.com/uploads/files/96369525035.pdfIn PDF document text
    • http://abnicum.com/files/file/72763183071.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/522083a1526254af08d239c4de110586/91001638832.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c15ac6200d---13930397124.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/kedit.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/96885774602.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149a088c48---9666784953.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/14da421ce29ffb752d55dec9edd9e3f7/30158587727.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78dea4589---kudisenekumeda.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161476447667c6---tesuribabemide.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/vejutafeguwovufe.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/xafovibenitufexajebo.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/8378230559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=can+we+install+android+apps+on+laptopPDF 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_off0000b3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CB 16144 bytes
SHA-256: ea8e2c78eef6527f34270f74f863b6b5279c5434031bcba960eb26c4a6a87d6e
font_01_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 10500 bytes
SHA-256: d46e77442c6ac10e773be9279fa7e662b8dbc41b5e6013b07914c0a54efa3185

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