Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0daa5ee50f24e4b…

MALICIOUS

PDF

124.8 KB Created: 2021-06-26 03:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60ea3731959cebe9028a6cf446ace096 SHA-1: a5a6ad5af399ac346c72a8cc365188db48f41b34 SHA-256: a0daa5ee50f24e4b79c05b42d5f82bfe95bc4358de06d032df3a292724e80e12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to distribute further malicious content. The PDF's structure and embedded URLs suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9788

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://crewmak.ru/uplcv?utm_term=how+long+can+fleas+live+on+humans
    • http://aucoindeshalles.fr/menu/file/totisivakubexi.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d34b09465077f1aa282f2116d4352d15/28465750687.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a850aa3320d---89590959751.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b56f452592b---bivabegorum.pdf
    • https://ozmutludokum.com/userfiles/file/69872095134.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f37bab9866c5341f6215da69fd244078/6388148021.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6e803b5e---33667140933.pdf
    • http://arcomproltd.com/userfiles/file/11934673084.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210619_817B9528CC8489EB.pdf
    • http://paoladebenedetti.eu/userfiles/files/18893658629.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/83568514371.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab17ca8d44---merakuduxemakidanegabuxa.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4733c92942---gejugejadumujurutefajone.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a7119e98ad1---53604151650.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/76d38a32cd1a8f0c647225cbdf790c11/rovofibe.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/a6948a021580f956865b38ac5b8bbe59/ladawo.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160831143a8621---58272159163.pdf
    • http://safeabortionnepal.com/userfiles/file/newofujavejegudisivov.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/47139441698.pdf
    • http://capmar.eu/userfiles/file/71104033227.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/o0tbpmju8t0q2f0oc7bbsqtp1a/fabefomevavuse.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/da3ea3b956b2732d80476b892762ef2a/lojuxofos.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5753137b---jodesiwetimirasuvef.pdf
    • http://digemnd.com/UserFiles/file/84268258430.pdf
    • http://yuanyoujie.vip/userfiles/file/72864402213.pdf
    • http://adaviestransportltd.com/userfiles/file/difavimadu.pdf
    • http://flatadministration.com/uploades/fckeditorfile/20043709569.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018406.bin
e1b2e2c929693c401e098f1d1b28c113f5b4be44365ca792c92e4dd2046f770e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18406 10828 bytes
font_01_sfnt_off00019cd9.bin
eee64745a9f97b154307d2f23c3754a9ea1ea5fe120506ea0b4c0567b31b828f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CD9 18416 bytes
font_02_sfnt_off0001cdb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDB4 16792 bytes

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