PDF malware analysis — malicious · 4fda13f582b9b092

MALICIOUS

PDF

90.9 KB Created: 2021-07-20 02:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: f7d44d4ca0f13e3d09f6e390dcd0f2a1 SHA-1: ee7e023095d95164fa6ecfea4bbc5d269a8a9e8e SHA-256: 4fda13f582b9b0926492dea46b820c2c0bf285c80a471e5fb2c50ffbe9bee5f9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://amon-syotengai.com/userfiles/file/2306094254.pdf In PDF document text
- http://aaaexpressheating.com/userfiles/file/nubobepojimo.pdfIn PDF document text
- http://kaupa.cz/userfiles/file/jirejawimegasa.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07d158b31---36743419440.pdfIn PDF document text
- http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c80d2c2b7---85049337660.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f964f1e9ad---kapumekaxavamemapijuz.pdfIn PDF document text
- http://shinies.ru/img/lib/file/zabibej.pdfIn PDF document text
- https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/pk41hmh6p5a8mrl2qujf2lf813/sedujuviviroravozewifelo.pdfIn PDF document text
- https://pk-kuepfer.ch/ckfinder/userfiles/files/94323552640.pdfIn PDF document text
- http://fitnessklub-impuls.pl/uploads/assets/file/17107749474.pdfIn PDF document text
- http://jump360.co/upload/files/20210704071206.pdfIn PDF document text
- http://dieta-plus.pl/userfiles/file/boxuwim.pdfIn PDF document text
- https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/4r18kmcjsae5801b5sgor7hhr1/7775687247.pdfIn PDF document text
- http://portalcom-b2b.es/img/user///file/_0020720001619806878.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89407566295.pdfIn PDF document text
- https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/46e9da4eba42071419c0fccbe4c26796/niwisutogisexusuja.pdfIn PDF document text
- http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bebd17b75---24147744346.pdfIn PDF document text
- http://k1a.ru/images/files/file/kopiveperelow.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2ff8037e8fc9930371b6fae64814a60c/1897768383.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd7bb6ec8f---vebozapiputoxedut.pdfIn PDF document text
- https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33eef2c37a---zafewarunikukebifa.pdfIn PDF document text
- http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075e98e1c609---gejazopewomiwajubuzuga.pdfIn PDF document text
- https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad75ed9340792a847ef060c081fd4185/kejozomerusedo.pdfIn PDF document text
- http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/n6vu2km2qgoj7ut180rr6ep3f4/nusejatoseb.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pooled+regression+analysisPDF 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_off0000fcd6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCD6	10440 bytes
SHA-256: `1cdb8b47ecc270614c68b1bbda3ca6f54ca3a91ab2962cddf491da46ec6d0259`
`font_01_sfnt_off00011460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11460	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012c72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C72	19608 bytes
SHA-256: `debb258305474596912e0a6b982c4179e0b1df183caf5cd34777fcacbfefe24e`

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