Malicious PDF — malware analysis report

Static analysis result for SHA-256 532c2d6f2ef07632…

MALICIOUS

PDF

155.5 KB Created: 2021-06-27 18:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1454c0ce995494a27480be1172503150 SHA-1: 5941674773e92f50f30218cfac763968a6a5164c SHA-256: 532c2d6f2ef076320f72657f3e4f73bee37d13a21f3b572a1c2376037620bd51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8666

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://twr1115.net/files/fckeditor/file/vipemozeretegejotefu.pdf
    • http://sllight.ru/design/img/upload/file/80327359815.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/43081a30d911d1ac5fcdca81651d9277/mudebudigub.pdf
    • https://memoservicesrl.it/file/fanonelekuke.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/q5i3l5pkt6pps3aba4jhmauke7/befinitizukuwotazo.pdf
    • http://brooklynsmokeshops.com/admin/images/file/rovozikojakosome.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/0ks27tv7lh8p7vfp0r9qvckg43/47876394956.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/55c7e06ef933aff765fa52611528ef6f/kabezenobojatizasog.pdf
    • http://kinocosmik.ru/sadm_files/70647645064.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b808b2d45---71186662398.pdf
    • http://crmrealty360degree.in/userfiles/file/44826819629.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jv62eo2phjgjv312brfe3a7a04/ramup.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0caabd3ce---73300229100.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc76f2d13---refawidazesuvuwobigadu.pdf
    • http://jrpst.pl/userfiles/file/11686264831.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c228e8d5c---nevapatidewakinapebi.pdf
    • http://hanasushipickup.com/uploads/files/zabakes.pdf
    • http://doo-san.com/userfiles/file/20210511071113.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/58f8a39e9e2393a46d7874483cfed2bd/totidelafugakuromejaxa.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d4d852cd1---bidoxedomodi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc02fc605a---gojafenitefebumugepim.pdf
    • http://emeat.ru/var/files/83584815119.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f19d8875d---xufugasireroxamuwumefura.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609654566b37c---nafetazaw.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde956c381c---25900518139.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/0307ddea8fe09ebd97f7b068a544cce5/jufosiranufata.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=it%27s+worth+to
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00016fd5.bin
4d6c97fe770fdbdd75778000e3fb58ab099d408180f0977b4131369283022962		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16FD5 34468 bytes
font_00_sfnt_off00015a54.bin
f5f99a6004c1f26e7bbef8323f810874608f5edd9dc87642cbbd38aabea870f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A54 9740 bytes
font_02_sfnt_off0001b0ce.bin
930131e57b3adac65a572be559ab62da8d043477457afca4d4919e77d7feeb00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0CE 38340 bytes
font_03_sfnt_off00020576.bin
1dde3b1c88edb28350d54f72c28146d6bb47b3efc25b150c84ec17d22239b1fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20576 22448 bytes
font_04_sfnt_off000247a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x247A0 16792 bytes

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