PDF malware analysis — malicious · e404e2b01ae6787a

MALICIOUS

PDF

69.1 KB Created: 2021-09-10 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 51840d8e3daeb28e56202abb291eb3be SHA-1: 5667ed4242786c7c6da9f9c6a45c7011ccd75ad8 SHA-256: e404e2b01ae6787a313e9d0abe5b61d5b5cf62ebe07bf9ba0cedafdb68ff1a4c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many distinct hosts, suggesting an attempt to direct users to potentially malicious content. The presence of multiple URLs pointing to compromised CMS upload storage and disposable hosting further supports this phishing and malware distribution vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://diamantina-joaillerie.com/ckfinder/userfiles/files/76730256082.pdf In PDF document text
- https://thefertilizergranulator.com/d/files/tajinevasedexikuzusi.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d8f91288---82625820159.pdfIn PDF document text
- http://pcserviszlin.cz/ckfinder/userfiles/files/zegenagopasaxeli.pdfIn PDF document text
- http://tongshengchem.com/ckfinder/userfiles/files/6270768398.pdfIn PDF document text
- http://matchedtubes.de/userfiles/file/79572409450.pdfIn PDF document text
- https://feniks9.ru/ckfinder/userfiles/files/nuriripibabumuje.pdfIn PDF document text
- http://www.dogwoodagility.nl/ckfinder/userfiles/files/65373393566.pdfIn PDF document text
- http://spartaksedlec.cz/spartaksedlec/userfiles/file/9642807264.pdfIn PDF document text
- https://parc-hotel.info/file/bejodoganusozawew.pdfIn PDF document text
- http://mariekevanvlierden.nl/survey/userfiles/files/sofexelokin.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fdb8bd3o5vodhj6njs55brp7q6/xigekivafekunorete.pdfIn PDF document text
- http://epicridesnepal.com/files/dojozikanuvugog.pdfIn PDF document text
- https://aluminiosarla.com/userfiles_arla/files/segudojanatetiperugafuzo.pdfIn PDF document text
- https://mldom.xyz/web/img/podborky/files/zadesomijogixu.pdfIn PDF document text
- http://aranysolyomfeszke.hu/editor_up/27357977621.pdfIn PDF document text
- http://webs123.com/userfiles/file/83243120414.pdfIn PDF document text
- http://mail-business.ru/uploads/file/madino.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/33825641767.pdfIn PDF document text
- https://brigitte-farner.ch/userfiles/files/subejabetogujurivupox.pdfIn PDF document text
- http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e713561cb---69951987322.pdfIn PDF document text
- http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kewuborogumepenenex.pdfIn PDF document text
- http://nuitsdartistes.eu/images/file/84107350816.pdfIn PDF document text
- http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
- http://sculecuacumulator.ro/app/webroot/files/userfiles/files/dafaputugote.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+flutter+vs+kotlinPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b228.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB228	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA3F	10424 bytes
SHA-256: `39b8d7ed817cc33813e748f3c8d6990b169568166eba53a8332546b0e4ece8a3`
`font_02_sfnt_off0000e207.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE207	14808 bytes
SHA-256: `fa7fdf446ee3921ced232c11883d5534e3bf0fcb96ecfc0085a5333354219608`

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