Malicious PDF — malware analysis report

Static analysis result for SHA-256 5939b1351dac63af…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 22:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9a7effc8af5076007011c475b80bb79 SHA-1: d5580bccb9597231e1e4fcf04bf2a190ad487445 SHA-256: 5939b1351dac63af0d11ab8e5e23594285de7f536a5eec8a040f6a3247a6b934
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://annjulieskarpmo.com/userfiles/file/2061246150.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4e947d887d748aa9353de25a60c27368/lepelufilosojuvi.pdf
    • https://zulapin.com/calisma2/files/uploads/dowoninedukamikuwital.pdf
    • https://fenixfalt.com/userfiles/file/geziwidajovunabegobox.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f0a59cf1---35510395109.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a85d27bdce7---6073973186.pdf
    • http://heninrealty.com/userfiles/files/fixugegopinidefobomobojaj.pdf
    • https://okazdedziecko.pl/_files/Media/file/84799438790.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/garufane.pdf
    • http://abogarestudio.com/userfiles/file/guluviluzozegepigij.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23e66d18df---modoneror.pdf
    • http://beijinghuojia.cn/userfiles/file/xujakededimex.pdf
    • https://gonguyenkhoi.vn/upload/files/bajenuruwekadupenus.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d8c86686---40585050117.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd096d71e61---38619582894.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94ada143c---sufuwolo.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210605_A86614FD7BE7A4F3.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1e050edce682d52ae0c9b308241ab68a/xador.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083a62e3a553---288098970.pdf
    • http://altinay-law.com/images/file/39098868692.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s1940s727pj4e3rd9k7v32m5i7/9369676028.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d6de4848c---ledaxomowanajituvup.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaba333c2---90984927284.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf908de8046---79262562065.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaab274e160---31884422948.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/birizasolon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+chaplet+of+the+holy+souls
    • 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_off000102d0.bin
53b793bf70738e6f115e588ac6122847af9b7b7514463b256e2e0968ca824379
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10456 bytes
font_01_sfnt_off00011ad6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
font_02_sfnt_off000132e8.bin
dd18666ec220b5025b696355cd7b1a662c2d402a9faca1c709510f775b87980f
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 18124 bytes