PDF malware analysis — malicious · 78efaadc264fcd7c

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 21:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 80c8405090bd2930f5cdcfe7b17539cf SHA-1: 8cebb11e89d09c242384b2a169f6f125272c4036 SHA-256: 78efaadc264fcd7c162f51837b87eabcbbce9dec9f5843ecb288461d397a1f4a

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for distributing malicious content or phishing pages. Heuristics indicate a compromised CMS upload link and a link farm on disposable hosting, strongly suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://catamma.ru/uplcv?utm_term=get+them+all+premium+apk PDF link annotation
- http://stamforgtechnologies.com/uploads/rufego.pdfIn PDF document text
- http://cioccolatogallucci.it/userfiles/file/16023648353.pdfIn PDF document text
- http://gaytonfa.com/upload/files/tezitazixokidarasoti.pdfIn PDF document text
- http://think6.net/ckfinder/userfiles/files/20210914092517.pdfIn PDF document text
- http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodamulitawexiguno.pdfIn PDF document text
- http://www.deco-interieure.com/userfiles/file/87871812201.pdfIn PDF document text
- http://lagunarent.lt/ckfinder/userfiles/files/didisixosunizulokezaf.pdfIn PDF document text
- https://sikanderajam.com/Robinson/ckfinder/userfiles/files/vetumu.pdfIn PDF document text
- https://gretajensen.com/ckfinder/userfiles/files/bupiparipeben.pdfIn PDF document text
- https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8c8900e47fe310d59639c2e208f2be92/xukudisozowanakivifawatix.pdfIn PDF document text
- http://intersonik.eu/upload/files/14197403340.pdfIn PDF document text
- http://sanarina.de/ckfinder/userfiles/files/9222269655.pdfIn PDF document text
- https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/65l5defp7c3l8pdqpsl4ni5k2e/riwasawuxurakebibod.pdfIn PDF document text
- https://villamishkan.com/310renonew/front/images/files/17380371150.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a300f5bc---2721023128.pdfIn PDF document text
- https://underworldgear.com/admin/images/fckImg/file/waranano.pdfIn PDF document text
- https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dec3504fc---72498910573.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140140b1df70---40872476875.pdfIn PDF document text
- http://capesociety.ca/uploads/files/67770276955.pdfIn PDF document text
- http://levakov132.ru/userfiles/file/tusojozedivijavogel.pdfIn PDF document text
- http://photou.cc/ckfinder/userfiles/files/22917686873.pdfIn PDF document text
- https://reparationmobile.net/userfiles/file/46898277102.pdfIn PDF document text
- http://abworder.com/uploads/files/90452970971.pdfIn PDF document text
- https://bhsbeacon.com/FCKeditor/file/20236918112.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://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_off0000d499.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD499	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ecb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECB0	10356 bytes
SHA-256: `33671cb020558f941926636852249911654d7c82288c0c4e5ae191b868d73603`
`font_02_sfnt_off00010407.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10407	20892 bytes
SHA-256: `291f03c00c8b94767bcab3c52dfdb47b62ec90bfebf1da07fe70daa53bfa70f2`

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