Malicious PDF — malware analysis report

Static analysis result for SHA-256 429f77bb4e5d9b56…

MALICIOUS

PDF

98.7 KB Created: 2021-09-05 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b162339f17b8715462f08ffb574d144 SHA-1: 3876169f5be8258cc4e428137902a40f2a3c2089 SHA-256: 429f77bb4e5d9b56934022bc9f6072feef5bfd76449abba167129b2309abff30
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which host other PDF files, suggesting a link farm or distribution mechanism. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to install or connect to a remote support tool, a common tactic for social engineering. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into compromising their systems under the guise of support.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 http://maxtarget.by/ckfinder/userfiles/files/wowexobezawet.pdf In PDF document text
    • https://rajaunited.com/contents//files/66245452592.pdfIn PDF document text
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/72446735402.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8c1cc1d2ac16301858dee67cceda4a80/simokakukedares.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/zedimaxipobaxuzizejop.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/70415647548.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/84240011906.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/mukufu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t1lc0s2vqkeqq3phltaihd0t51/fisurabojusapab.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607d59237db9e---sakezudadisamanenawekala.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/dararegetiwabavisil.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//paxutunimogapunixiwer.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/vokozegarewitijapij.pdfIn PDF document text
    • http://shosholoza.de/file/86239934745.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/44560350941.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc918d615a---mafibowegepun.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/lelojopilegibajekezegemev.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/42759135288.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210808102633.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/tazazanojixatavemujot.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/73677515229.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/kirogiw.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/niratenipuziwirukeseset.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/96136422232.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/rafojobotoj.pdfIn PDF document text
    • http://huefpdf.org/upload/file/16795551343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=aircrack-ng+manual+espa%C3%B1olPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 11032 bytes
SHA-256: ceb5eccd77b05a1bb28e25b8dfdeae94250195bb454223d394e454bf9b25c35d
font_01_sfnt_off00012a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429F 22036 bytes
SHA-256: b8bd1f8ff59f8e9fa56d126add5a62f95ee1250d242542dbfb6868b3821cd242

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