Malicious PDF — malware analysis report

Static analysis result for SHA-256 4780e76eb0f348c9…

MALICIOUS

PDF

81.0 KB Created: 2021-08-31 03:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fdecd61ab5c87abead81d560a5a7685e SHA-1: 88166b7fabbd7b6f9f14a7bc9c13db1b95e72502 SHA-256: 4780e76eb0f348c964bc43f636d968cd1efc3bbce167029efa9417427e2bc602
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit users by directing them to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://odontologosmalca.com/images/userfiles/file/sutajane.pdf In PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4019d62985---24528056302.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/77273677071.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160fd4c93a7b6c---74674648410.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af640130fb---subikoduv.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/panoli.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf81c31331---92369526983.pdfIn PDF document text
    • http://le383.com/uploads/files/beridawusir.pdfIn PDF document text
    • https://totounited.com/contents/files/49607819883.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/44c4b4e569ffb0642ae06671964092f8/jajijufiravide.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/jokuxesive.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612805f662238---lalipimijodanozodagajejog.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/nebififumafa.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/99936867875.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4296895302da14e5a395915b78ac3ce3/72507269574.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/rezizoxasevafif.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7a6305e9397b7b55ad50e427fa6218ef/jekora.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/la46f539dpai0bdte3iari0ep3/nimob.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/79107661800.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/luzutopokuxubodi.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/62168989284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=benzene+ring+with+ch3PDF 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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 19032 bytes
SHA-256: bc44bd58b6e0da3d3bd6f6c93068044d1905a3f62cef3a080253d5b819961710
font_01_sfnt_off000107be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BE 10384 bytes
SHA-256: 0fdcdbfa2835068be94e0c646b00fdb6e86e0d07c61590da2fe825893749e225
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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