Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7437c49fe822561…

MALICIOUS

PDF

69.9 KB Created: 2021-09-06 18:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10c29e74edfbb5593ed8df931fab9f13 SHA-1: 750ce97a30a8098fe3f07aae38b404f690f08e11 SHA-256: f7437c49fe822561399affab2bc84e888aeb00471cdad026b449b75bbda73580
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://armagedonspedycja.pl/files/file/15972201801.pdf In PDF document text
    • http://master-vin.ru/files/file/numazi.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/51270468591.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/22836279526.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/83821400855.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lilaxa.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/b5cb26709f33171ad529986a3b15dde6/42873664568.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/rerejali.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/5pjpo7d7rtg1j8u73n994snhre/jokupaporu.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af86e2026f---88088532792.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/62448841895.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/3846901723.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988fe52e34c---didomogedegukinisu.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/4f31df9a7219546c52074817f310ea85/77410879371.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tasagadofunotitoxoriziro.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/o7f3litmc0jliiiljba0imvgq0/8052806553.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lomanatugeromotakisuribe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161166dada17dc---fejobosifos.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bb7c3b5475460367e73878d78310bf59/51623924937.pdfIn PDF document text
    • http://springbook.no/files/siwukenikapotozifojobimar.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jrs1aor1t5eonp9f14ngd3a8ob/52593242653.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/59121145659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=natural+tangent+table+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_off0000b650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE67 10508 bytes
SHA-256: ccbd196807d0209afcc6947578ffb870531eabb29a36d899a1260bf41ed5d0d8
font_02_sfnt_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 14788 bytes
SHA-256: a946982740da8ecccb348e84ddc38b2aedccd7aea41c0980819adf5b8b16e45a

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