PDF malware analysis — malicious · f4efe5bb351f10a5

MALICIOUS

PDF

78.3 KB Created: 2021-09-27 11:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8d40757c3073231af7c1f05060662b63 SHA-1: d261c166172e66fcff50c7490b7f91d91f567921 SHA-256: f4efe5bb351f10a5194057ab11ada4e0e16fde39ba16af9378c1ea3f209db21d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure indicate it's likely a phishing or malware distribution lure, potentially using JavaScript for execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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://aradovan.com/userfiles/file/rofokelilobipogatetowured.pdf In PDF document text
- https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e81c18364c---jokulinunelog.pdfIn PDF document text
- http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81778422861.pdfIn PDF document text
- https://postelezmasivu-praha.cz/ckfinder/userfiles/files/80583160020.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613452db0bd63---belexebokekovazajebokuv.pdfIn PDF document text
- https://sleepthai.com/piceditor/file/zerokegu.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5cec6a3bfa5dfd8c54fd01e9e30aa092/98845002136.pdfIn PDF document text
- http://brilliantsolarpaneling.com/userfiles/file/sasenaxedilurur.pdfIn PDF document text
- http://www.mattig-accounting.bg/fisiere/file/pisogugagizeketo.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/8tqcau139ll3vte1bcpnpjs6ic/vovovavunukoduginezoge.pdfIn PDF document text
- http://robwalker.net/fckupload/file/riposedibunulesat.pdfIn PDF document text
- http://kashima.cc/userfiles/file/16058156518.pdfIn PDF document text
- http://headlinesdinerla.com/uploads/files/dugapimifu.pdfIn PDF document text
- http://annabarons.com/files/files/75967685294.pdfIn PDF document text
- http://cowmoo.org/ckfinder/userfiles/files/93307662998.pdfIn PDF document text
- https://magerp.org/upload/files/54323463498.pdfIn PDF document text
- https://www.zochrot.org/ckfinder/userfiles/files/34905367280.pdfIn PDF document text
- http://grubstreet.ca/ckfinder/userfiles/files/xomuvurijaborajuxunudole.pdfIn PDF document text
- https://galedo.cz/www/data/cms_files/files/97078512185.pdfIn PDF document text
- http://lmtechsolution.com/userfiles/23563595185.pdfIn PDF document text
- http://dade666.com/userfiles/202109file/2021091302234770554.pdfIn PDF document text
- http://www.rannatennis.ee/data/upfiles/files/xemoged.pdfIn PDF document text
- https://inprovitcentroamerica.com/ckfinder/userfiles/files/bonaruwowulelakojozodanel.pdfIn PDF document text
- http://pc-driver.ru/userfiles/files/64011778639.pdfIn PDF document text
- http://kleinschadenexpert.com/userfiles/file/rakelifafaludakakitogule.pdfIn PDF document text
- http://digifast.cz/userfiles/7851206283.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quickbooks+mod+apkPDF 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_off0000c2ff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC2FF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB11	21192 bytes
SHA-256: `dff834ed308a5ca5ae3e8a046bbca78b5712220af49d8676e198991049a7c52e`
`font_02_sfnt_off00011234.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11234	10588 bytes
SHA-256: `5516cf620dc62d53ddc2cb782f08542a825ffb1a7b94e26162ddfd505f70411f`

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