Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af475e024890073…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 16:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fda34ad9f2abbe75013ca1961c753a1 SHA-1: cd3c579b5975aa235a5e95477f77de47f382752a SHA-256: 8af475e024890073b250745867678d7cd041c742b918063e9ad76578ce847dad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of `utm_term=samsung+galaxy+apk+download` in one URL hints at a potential lure for users seeking software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=samsung+galaxy+apk+download PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22a8c495e---97812934416.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/rovuvoxosukobaja.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/jenetupodor.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/50913260843.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f113ca66a---mitikexidugexo.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/13552245699.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n8192sol5fsic9j9u6lvicmmpb/rawewo.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135b30286f4f---tumigewemodomenizaf.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56488385097.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/8559709925.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/6326745482.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/49651425537.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/70746831657.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/79300225557.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/67054640782.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/95455457135.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/piguzajapisovarixarirusiw.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/31108543250.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/57583788851.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109121859179471.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109070912481502.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 14672 bytes
SHA-256: b88789a0ac70c0fbadfba099f022f124f3be11b6c70a9dbd9a8af0effb9a6fa1
font_01_sfnt_off0000d2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 16632 bytes
SHA-256: e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
font_03_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 10880 bytes
SHA-256: 35496c694c1cdfc28c190ffc4dddc6eb873a403ffb6f5a2b999d81f6a8cd2f4a

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