Malicious PDF — malware analysis report

Static analysis result for SHA-256 0313b091a7340378…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 00:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce4d41ebe7ef525fd2a4622ec8e77e1b SHA-1: 4c2cb5a9e68182db42fce1c03a1d50de83fb264d SHA-256: 0313b091a73403783d9aceea4165ba483489985f678c09ae0963099686483b6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host phishing content or distribute further malware. The use of compromised WordPress uploads and disposable hosting for link farms is a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c0f52b4cb4aba48ff185c67faacf5eb2/96467619539.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/oaqtnnv4lkpviucfkt4hba8r96/57014900912.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/leo5ur9coikc3mnc5iloq868q5/tadimefivadobupabofewosud.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/9uu00jjoj61kkc138rv0r68e1p/18790989852.pdf
    • http://grandrosso.com/js/upload/files/46784338932.pdf
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/8961771122.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1f3e9f4a7---janojotewomurerimoj.pdf
    • http://architettotamborra.eu/userfiles/files/jidezifezewalivowop.pdf
    • http://minutemen-jrotc.com/clients/84940/File/rulemixogogi.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79c9661e66---jidubilivowusax.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f86932ab7067391afe11304b2ebd8b14/17079136882.pdf
    • http://esoftland.com/userfiles/file/49672189357.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ed17743f6b9---bomofafanorer.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sopepiwoma.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2467d9de---31374406430.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729fc6b4207---vesitokolonozefigamutufu.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rq5r3janjsbi8n6rub6rpgeq57/96924485297.pdf
    • http://czdashan.cn/uploadfile/file/2021051009285073499.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210802_49C2088619BD3023.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/srg0per5qboh1sna9frmsj5vij/55001781065.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5a0e5a4aee137b237f8fed870690ded7/8746322043.pdf
    • http://dolphinegypt.net/userfiles/file/68961150740.pdf
    • http://supragyn.cz/userfiles/file/10560825776.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8150e9a68f25a36f33e318b4f04ac151/nerigafofupazoberajele.pdf
    • http://studiogiamberardino.it/userfiles/files/21100487623.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d53388c7f---piwesepere.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pigeon+compact+steam+sterilizer+manual
    • 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_off0000c9ac.bin
8d60392934b1a7bd2ede16d4e207cb27701cc39c90346e65ab59197d60ef8dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 17984 bytes
font_01_sfnt_off0000f886.bin
948b7b0247abbac082ed60c4e7ac65b135b3c6cfbaf62dc5d469966f4584c88d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10880 bytes
font_02_sfnt_off000111b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 16792 bytes