Malicious PDF — malware analysis report

Static analysis result for SHA-256 248cc54bbfd23942…

MALICIOUS

PDF

86.2 KB Created: 2021-06-27 09:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36d451001124ca039a9502f38b3bd1f9 SHA-1: cc0b25e6eb233230c490f92e187350865fb3a56a SHA-256: 248cc54bbfd239420dd595a7f1d36ffddba172ef0c1cc9e3f741de0547c14be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=minecraft+ps3+seeds+with+all+biomes
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7db36bf2---59316812097.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42e74d1d4f---70312682576.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/sejevuw.pdf
    • http://elsekmont.eu/userfiles/file/mosukajanav.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87662514363.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/tufoxebovanejijowobeg.pdf
    • https://playerpress.com/ckfinder/userfiles/files/23773834954.pdf
    • https://liniagdanskzydowo.pl/files/62740558271.pdf
    • https://brahmagnanam.org/fck_uploads/file/7900248343.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/68f415d39490d9baa20705e365ae1eca/zupugoti.pdf
    • http://apexnepaltravel.com/userfiles/file/xexevake.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec3953497---wavizedep.pdf
    • http://oasis-inwaste.asia/files/file/fevokerufezi.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/aa794ec520216133eb7eeaf7b5eb0dcf/59058015719.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806750b552a---86736454229.pdf
    • http://guitarenko.fr/img/files/94025137260.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d09ca0b1b8777d3a09a2ec9c3ec2510a/girij.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6a39fb85fb9f2f9e31dd8c2f6c162536/16641034775.pdf
    • http://bi-acaovo.com/upload/files/xetefetisegixewuzoxutas.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/lajoresiwusog.pdf
    • http://bidmitt.com/img/files/file/sewujixakufixuvuwizak.pdf
    • https://hotel-la-licorne.fr/userfiles/file/kexokolibopekubajavoluv.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160add7c5efaf7---xeforapogifuniba.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7440fda8---77496236622.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc61fee228---9775004653.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca1.bin
6f664560bdfe7b64e8d3a92ad14ab3eb6a136dea923251b178b0e336f76d6bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 11276 bytes
font_01_sfnt_off000106c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
font_02_sfnt_off00011ed2.bin
6aefceee085620ed63d3ef8410bdd0593905af605f17885e727aeef5b83232ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 17360 bytes