Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0be1ff8c4666412…

MALICIOUS

PDF

88.9 KB Created: 2021-08-07 21:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 601a50a6cb38706a21b9577b6a05b32c SHA-1: 91bb73fb54bfb2b9b11f0a73e4563aa45649eae4 SHA-256: a0be1ff8c46664126c9bd197e9a8ecde1acc0bf4c2b9a40eab8820c855b9818c
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a pattern of directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://balogmihaly.hu/UserFiles/file/vuwuxixusatik.pdf
    • http://okzawidow.pl/img/upload/files/lurebogijifobamura.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/valutov.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/fujikulawufejid.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073be0ce47e2---rumumuxiwibasumil.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2358678c26d2d43c400b81a4539cb394/zuzufivevi.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf2bb97de4---zitotuxurebewume.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2be9dd227---suzafewan.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/joa6ihrapsckrstmbn608ap74d/gawupij.pdf
    • https://gadd-asso.org/userfiles/file/tukuvoruwuzep.pdf
    • http://allycatering.com/userfiles/79283550222.pdf
    • http://autothudo.vn/upload/fck/file/64117217379.pdf
    • http://rbtyutj01.com/userfiles/files/33182557710.pdf
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/kikuturelefu.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dkmn74sl8ibidghnqdj5cdvbp1/xeker.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/aqdako5p1iii1s2dh5erikjb91/kujofi.pdf
    • https://seripin.com/calisma2/files/uploads/92870647103.pdf
    • https://sindonis.com/userfiles/file/37424200885.pdf
    • https://guruamardaspublicschool.com/userfiles/files/35036700594.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca117422b---63576389044.pdf
    • http://kameleonhastanc.hu/files/file/66787576195.pdf
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32736615929.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859f3f34e9---49776232159.pdf
    • https://bdaudit.ro/userfiles/file/vusixadavadiziw.pdf
    • http://qamsar.org/userfiles/files/46313513181.pdf
    • http://goddesshair.net/upload/users/files/77748758898.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/bad8d247812196fcfe2ede616cf15daf/xilojepowimag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+a+reason+for+resignation
    • 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_off0000f9a2.bin
fc5b0f25f5c2ca56f2f22bcfc000a444f92e6f9d0c262e4a4f26fcf25db51319
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A2 17180 bytes
font_01_sfnt_off0001267d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1267D 16792 bytes
font_02_sfnt_off00013e94.bin
3c9adf9f718b5ffe93627669f358adbf88781b14a941c4149d3752b94ead69be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 10420 bytes