Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca0989cee17a788…

MALICIOUS

PDF

89.5 KB Created: 2021-07-21 17:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a8ee79fec4d805fc0844629cf810841 SHA-1: 5d077457f0853213b14f9ca82af781cc6794a00f SHA-256: 5ca0989cee17a78889a712bfcbf1285d093c41e0deecaca72936dc5be10ae530
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://asiadomainstore.com/userfiles/file/fivafa.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/juxofolovot.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/butaturij.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868da673409---87676309696.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/8116185577.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef3472371---75618784607.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/purutodorinekuk.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/bukokuwasakiw.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/munav.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab76b0a23---mupefofewevi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/12002693723.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/tovuputuwiwurololo.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/vosisib.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070eae270b74---tukolabaxobar.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f77877c9---tufugetawogebusuf.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae01f9b001a---30658583671.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/nowezonepiwoxutufifif.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sexusederomuti.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/507845a7ef1afabfdb4d7b0c3459f88c/36870928248.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874046a464b---45784534552.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608208e92e9b3---potefigiruveravo.pdfIn PDF document text
    • http://jinyezi.cn/upload/pogumunekuvisifexegavo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/83195004898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=factor+affecting+enzyme+activity+pdfPDF 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_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 10964 bytes
SHA-256: de2cb2e8cb0d7cf5b75c1675f4b108cdf289da4ce2fa2421e146f801d98373b7
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 17772 bytes
SHA-256: 7411d692b0cca81ae1f4fb38448e6bd9c1bceeefe48f2d08d5729b95c968b1a2
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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