PDF malware analysis — malicious · fa8dac9fc27a6fb1

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 07:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 5f9bfe1de87797af3c8b3d05a47e461a SHA-1: a1550c36bcf424700930a4f4dc876bf3b2ea2dc2 SHA-256: fa8dac9fc27a6fb173886e42506e0cdfee913135fd43146215a2c270b259ed54

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to trick users into visiting potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://s-privod.ru/userfiles/file/75162076661.pdf In PDF document text
- https://autosaloncenter.com/uploads/files/82835930920.pdfIn PDF document text
- http://senseoftourism.dk/userfiles/file/2786531103.pdfIn PDF document text
- http://kapalishakti.com/ckfinder/userfiles/files/20072594752.pdfIn PDF document text
- https://cuatudongsaigon.vn/uploads/files/48008923210.pdfIn PDF document text
- https://pezenasenchantee.fr/userfiles/file/rabufasefokalu.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7889dfaa6---feforojavenavujupisega.pdfIn PDF document text
- http://ebrinteractive.com/userfiles/file/62240764921.pdfIn PDF document text
- https://ghadir-eng.com/userfiles/files/80364798006.pdfIn PDF document text
- https://oldd.adventurenetbg.com/userfiles/file/30402285010.pdfIn PDF document text
- http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/64908391062.pdfIn PDF document text
- https://highlander-inn.com/assets/userfiles/files/60471072631.pdfIn PDF document text
- https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0is4hk04ru0sa8fmnikoqvsae1/betojaxelorosimopuximomul.pdfIn PDF document text
- https://ijieet.org/ckfinder/userfiles/files/79172846212.pdfIn PDF document text
- http://kapfenberger-schuetzenverein.at/userfiles/file/84640347775.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327e791269a---88281977310.pdfIn PDF document text
- https://chezgregoire.fr/userfiles/49049669349.pdfIn PDF document text
- https://cremyco.com/app/webroot/docs/file/22591354598.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=word+legend+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_off0000cb0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB0A	10464 bytes
SHA-256: `937309e90a48254b2068e98f3f9ddbe1dfef1ac05b1d8a2b672a23b6f6b2f4ad`
`font_01_sfnt_off0000e27e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE27E	23828 bytes
SHA-256: `6cc387d5d525d553eba1286442869f8001ea13d727f345f63cdff2b7b2e5c019`
`font_02_sfnt_off00011fdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FDD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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