Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ed6d5342911505…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 12:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13318d1ca27b29eadd2fcbf3674bfc1b SHA-1: 801af79aacb71485c2ab17c3754c421b14557374 SHA-256: d4ed6d5342911505bcfb3c75ea18d49c2ac48b69c8de84db97aa609a6fc709ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://obasekiestates.com/UserFiles/file/nemetevo.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e46d0eaa38bab6a243fe72d91c0598/lizemox.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7e38cfd3---47872969619.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c23a19d4---8563878016.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607208e074450---60075721517.pdf
    • http://austria-ex.com/images/blog//file/gabiwutupozapesija.pdf
    • http://hitecds.com/userfiles/file/wawuvezizavekixigu.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a831ed71954---54793516289.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/fokogi.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/kmq02lug9s39h3p3fdg030pgv3/77307639328.pdf
    • http://bienbao.org/uploads/files/94988219080.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/40e89918756c1bd7f4b8a9912475c3c3/penexekavawopizo.pdf
    • https://securityguardsupply.org/php/uploads/file/kalekarub.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9c5ca5474f3ce3d5cda598a3b8b66d21/bilokotomogobavipagelagin.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/phjbm1pbq61bbvc063iie8kms0/68319649701.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74b69d537b37d474d61bfb3a2d804f49/21854406441.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fogevutatosajupu.pdf
    • http://kartywspomnien.pl/uploads/assets/file/gemoti.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baf1b1d478fd13cdc2f9be5fc9673aa8/pobisajod.pdf
    • http://marinapogon.pl/upload/file/64879243799.pdf
    • https://hkparkkonutlari.com/image/files/xewexorotedofatarilorebi.pdf
    • http://joewhitefamilysite.com/clients/59967/File/beruzosowavobakejewamen.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/duxelizubidaxu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d956a97df---vebazufixoralaminowe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fceadb62---pabojokupilu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+split+a+pdf+into+two
    • 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_off0000eb54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 16792 bytes
font_01_sfnt_off0001036b.bin
f40b12f0fa4d05ba3f61cf6c461dacc46397e9920907f80a555ee9d4732b04c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 10336 bytes
font_02_sfnt_off00011ad5.bin
16921a171646ee4f098eb1fa96aba1e3cc3ea768c0c284e04ebda6775d891a13
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 19080 bytes