Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b91dc976801dcf4…

MALICIOUS

PDF

93.8 KB Created: 2021-06-28 14:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aea0dce8d93c2e73a4bec51451651cc1 SHA-1: 7528e82e89502ff1da5ab75f28db32a2319b856f SHA-256: 0b91dc976801dcf4810a9916677a78c27b0db30d8ba04a21a00e18d6184154c0
184 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and multiple links pointing to potentially compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick the user into downloading a second-stage payload. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://docando.es/js/ckfinder/userfiles/files/wasigeparakizituseji.pdf
    • https://blokhol.com/upload/files/wujekerexu.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160720b45d846c---rifilozakizixowazafixo.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998fe8d8af7---vulosisijusewesusep.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9fc665ab3---diwevawedavajivu.pdf
    • https://mudraconsultancy.com/uploads/files/13413242280.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949870a27ab---57909917542.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ll2a6kag88b7882u6u3hhf2030/fosexurinupozubimiw.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609293d8b49ea---49123318541.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7a12a8bd---pezivozedujanagasulakixo.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/itj402tc2h8fvfi1gapj6lbbvt/kuxuxiguvavipofadafazux.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a0342c50---mikiloxukumeno.pdf
    • https://autoprofi.ua/userfiles/file/taparerezuwigurakuteb.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb12370d61---xuvutugemofo.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bded98999fd---lagilu.pdf
    • http://hasici-pristroje-eshop.cz/files/file/nepasilatasafaxijomegikuz.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d390de5a4---subenometu.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607251a9acc20---milubala.pdf
    • http://smepil.com/ckeditor/userfiles/files/baraxavu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4e68a284a---muxedob.pdf
    • https://studiovizia.com/webroot/img/content/files/24587781767.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8c785c4af345ba239cd61662a216a881/81333957520.pdf
    • http://conelser.hu/fck_uploads/file/repinodosufir.pdf
    • https://ivanda-commerce.hr/userfiles/file/tugajuwuwemo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dilatation+meaning+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010913.bin
cfb36cee1b9c3a671814bbe031626a96f8db1a0803ca6da9d7aae11103ecdc7c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10913 26376 bytes
font_00_sfnt_off0000d910.bin
9805832bb2434242f6e2fe4b8a7f23904e905ddf54d6ec8f62d406e3e93aea74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 18384 bytes
font_02_sfnt_off00013843.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 16792 bytes
font_03_sfnt_off0001505a.bin
3064a0d9dde901bcc25e8293a040d4093002d3f21b52ef50f0dc81e20bcbd736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1505A 10456 bytes

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