PDF malware analysis — malicious · e9d83c2bfb8f5ada

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 15:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 89de0c1cd9b8a4c0c012262b7e11635c SHA-1: ca1fd2dee20add8502a1dadfc683c6a3e83e3056 SHA-256: e9d83c2bfb8f5adac19590e28b063758605e87fc4e7fe2d26a5247993851fe24

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=dtdc+couriers+tracking PDF link annotation
- http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf647ac18---5446716522.pdfIn PDF document text
- https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb7ce6e71---42783629880.pdfIn PDF document text
- https://harteron.ee/userfiles/file/wilarixib.pdfIn PDF document text
- https://biharlokmanch.org/userfiles/file/63058812035.pdfIn PDF document text
- http://beijingxinzhi.com/userfiles/file/20210906144804_734479336.pdfIn PDF document text
- https://fleschimmo.lu/userfiles/files/43778745896.pdfIn PDF document text
- https://pacantioquia.org/aym_image/files/53535145183.pdfIn PDF document text
- http://joyerialaplaza.com/ckfinder/userfiles/files/3378143029.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/30912260992.pdfIn PDF document text
- http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gus1qmc9k5mmt6rpi454jo7oi5/tukapojojaxoxafobunutuge.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e70f5850d31e31027fd610e20bf72bae/89596933784.pdfIn PDF document text
- http://sun-apartments.pl/data/pages/95720998816.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/redababepalimawizob.pdfIn PDF document text
- https://lotusmarinevn.com/upload/files/96802873983.pdfIn PDF document text
- http://residenceraffaellotorino.com/userfiles/files/lixiguzo.pdfIn PDF document text
- http://mbfeed.vn/upload/files/melotuzovefim.pdfIn PDF document text
- http://olech-rzeszow.pl/userfiles/file/63874221274.pdfIn PDF document text
- https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/fa2e54402d5e2b9342830c2ee3830393/91658644105.pdfIn PDF document text
- http://vitali-schulz-eiskunstlaufen.de/userfiles/files/13598414262.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/17a997e8231243dd0433e3da4b74d69e/4838762550.pdfIn PDF document text
- https://www.iieng.org/editor/ckfinder/userfiles/files/gadavevadanegadixiwofeda.pdfIn PDF document text
- https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1d38d4a7---tegajoveperibubeka.pdfIn PDF document text
- http://trust-law-firm.com/userfiles/file/20210908120403_239358918.pdfIn PDF document text
- https://dnm.tw/uploads/files/202109130615535233.pdfIn PDF document text
- http://lor-rostov.su/userfiles/files/ganas.pdfIn PDF document text
- http://gutachterbewertung.de/userfiles/file/tipirukanekunofufisa.pdfIn PDF document text
- https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/wivizasuworirivit.pdfIn PDF document text
- 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_off0000d125.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD125	10692 bytes
SHA-256: `cc4cdf78b5916bb53066ac10e90206987602a51829ddb3b86985a1b52185f289`
`font_01_sfnt_off0000e999.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE999	17528 bytes
SHA-256: `514124e739c5b0f581852bdfe0119c5fcc01246e77faa26bad00f1153dc6fe40`
`font_02_sfnt_off000117a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117A5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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