Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea28b540b58cdfd5…

MALICIOUS

PDF

93.1 KB Created: 2021-06-28 16:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b98000f7d9777c083151cb5e59e7b2ca SHA-1: 6afe3d503c61fe044a65c45c0ae7214c52f7971d SHA-256: ea28b540b58cdfd51b59014c060a9d17cda85c391aebe7a66a965c5f5c830aed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=space+engineers+automatic+lcd
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/9lvvfoni8ven4b6nff1bufn586/loxadarivudazopake.pdf
    • http://proxima-design.cz/files/file/80668272430.pdf
    • http://biosite.ru/images/news/file/37851918438.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7e7695b3---feraga.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a224938b12d---jodamawazirajorudazuko.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/8702f27822eb3bfcebe5307a689cb8cd/79860458415.pdf
    • https://balaji-technology.com/userfiles/file/20105492863.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a922b636a---69937387157.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4f6d0f70---24499412867.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vlin1g1ooc6vra6be4jee5sfi3/nopigubexojutitefilati.pdf
    • https://suma.ca/upload/editor/file/89540059716.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a430b338f51---79786724814.pdf
    • http://au-coeur-du-temps.com/userfiles/file/41756504881.pdf
    • http://i-daa-wl.de/userfiles/lamogafaxobabu.pdf
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/12943513680.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985e5c05fdc---sebuterase.pdf
    • https://deesudcoolingtower.com/userfiles/file/vaforudumebep.pdf
    • http://skogsformedling.se/bilder_umeny/File/fazuzov.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/97813c5a0c51b9cfd9bbe3d74af4bd6d/24873669490.pdf
    • https://eminencesolutions.in/resources/userfiles/file/24522455205.pdf
    • http://haustechnik-hagenauer.at/59847750091.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/35267726721.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076585b8d481---26466348347.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d61aca640---jugal.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed77.bin
d828c37db05fb97c95343b0d746f1622718250675aec8b8ad63cf1117247840b
pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 19632 bytes
font_01_sfnt_off00011fc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
font_02_sfnt_off000137db.bin
aed8f5f7ad622849fd7c09e0fd1314950c60fc35df791c71254a26d36cd3f414
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 11032 bytes
font_03_sfnt_off00015147.bin
3ebd486235ab6c407a74d98ab9e1cf09d7661342c8c98090703f1c8ee3396579
pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 16164 bytes