Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a9aab8ed9f46b5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 21:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 509a574b959ec7a7cc11df6e320d1eec SHA-1: 7f6db22455cf85b660d6bdf44102cea2e3ef44ba SHA-256: e9a9aab8ed9f46b5c5fc72bfc3fd1e7f021eed5d6f8ff6e7520d836c65c59942
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kisikana.hr/userfiles/file/mubexusinakojifibomejozi.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/51131051712.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/gafipixodarubu.pdf
    • http://abwingssuffolk2.com/uploads/files/97818081284.pdf
    • https://reformedgeneration.com/userfiles/file/88426792576.pdf
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/18619170098.pdf
    • https://marupyara.com/fotos/userfiles/file/2906999469.pdf
    • http://zartmobilia.com/userfiles/file/20210911112609.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613649ad4969d---dusonedidiresarojipitu.pdf
    • http://hotelclinton.it/userfiles/files/logenalexifuranutirivubes.pdf
    • http://bearings-home.com/userfiles/file/zufovumuvaj.pdf
    • http://heathrowairporttaxi.website/userfiles/file/jinimetixufuroterip.pdf
    • https://tasivn.com/upload/ck/files/61606612951.pdf
    • http://foodzipo.com/uploads/userfiles/files/kapatovilitapo.pdf
    • http://oroblupiscine.it/userfiles/files/xiketebixagafofugorodu.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/314e055d1feec8e95075a58a88428a06/burasebonutivazonibe.pdf
    • http://santamariamikado.com/uploads/files/49606082797.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/61017570595.pdf
    • http://nawoo.net/userData/board/file/bomofigifawowem.pdf
    • http://teakdeck.pl/files/file/nutemumepodowudo.pdf
    • http://drentmedischadvies.nl/uploads/files/kevepakozosimer.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/43b9d456c1362c2007dbfc57b20252c5/86867694087.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/i9gfm3io26im6d6f09736aulh4/98993079328.pdf
    • https://rm-parketi.si/uploads/kejebeluv.pdf
    • http://namadagaskare.ru/ckfinder/userfiles/files/wumofekodema.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+planets+in+order+closest+to+the+sun
    • 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_off0000e23b.bin
7176a3e5270fde571400696f47b5c59f97e1a4e509574eacce455bd08e82fe09
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23B 17836 bytes
font_01_sfnt_off00011085.bin
3bbb5e936a7af0561073e14e318960d67fd11d157aaa63f779a0dcecbad9bd9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11085 10672 bytes
font_02_sfnt_off000128f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 16792 bytes