Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b71f67ec4fde08b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 23:27:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8acd885f01b0f2dd85f91c47c2db2223 SHA-1: e6d3c4f0e393d8b53aafc4077aa3beb5a27dbe56 SHA-256: 1b71f67ec4fde08b27c4490c43c8645888b227cf93aafb14006d98e6287e8d0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://queure.ru/uplcv?utm_term=free+movie+websites+for+android
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614816f1e349e---mukakapufapenonix.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614661ee5e6d0---13588812298.pdf
    • http://studiolorenzoni.eu/userfiles/files/gejitufunupufug.pdf
    • http://ct-tci.com/cttax/userfiles/files/romal.pdf
    • https://angelsforwarriors.org/userfiles/files/52608848690.pdf
    • http://immopolignano.lu/images/44813370951.pdf
    • http://oldmotorsclub.com/files/file/59951710753.pdf
    • http://wadsoda.com/UserFiles/File/47056186529.pdf
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raludalumujujotame.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda03abd9---dikutuvigubotobofip.pdf
    • http://studioturina.com/userfiles/files/wesumalowixenupefarejexu.pdf
    • https://www.meditech.cz/ckfinder/userfiles/files/dariviresubuxavuxeg.pdf
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riniwuwatelakebotupuxagik.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/risakugipuzakosomek.pdf
    • https://phnews.ro/files/file/99188409811.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bb60ea2e---pavarokogoweripomeru.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vufogekagarowezako.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c142d92a40---difibegeligojakidod.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/79b0aa1a8a6cb09f6fdb27227b7a628d/ranubep.pdf
    • http://paradisoseminatrici.it/userfiles/files/53080862335.pdf
    • https://abriganature.centralcms.cloud/galeria/files/natejezidironarovoduze.pdf
    • http://ty-universe.com/image/files/20210909_191425.pdf
    • http://chafewyuok.handysociality.com/upload/files/xodazuferovo.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/nekawadenirutajix.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/61488902581.pdf
    • http://motovelo-nmsk.ru/userfiles/file/54786058694.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_off0000ebaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 16792 bytes
font_01_sfnt_off000103c6.bin
8c0aef55501a1efbd5bd8087555704f122e0e64f7d7eef3bb1dcd6cd69f32f73
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10736 bytes
font_02_sfnt_off00011c83.bin
eb71700381f4de325089f0780e1efff32f0f63f99cbb8a387038bf3455ba8be7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 17524 bytes