PDF malware analysis — malicious · 5d88af7835c04298

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 06:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 56f5eaf37721f0acd046d7b8e10323b7 SHA-1: 4e79115e262e4fdd24c4f1304be8560b0c00cdf2 SHA-256: 5d88af7835c04298a72cfab3ba66282117d1d7f80cad7bf5fd5fc635d0c575e0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites, many hosted on compromised or disposable domains. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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 https://garglob.ru/uplcv?utm_term=business+management+pdf+for+shs PDF link annotation
- http://infrabud.eu/fckpliki/file/14970072114.pdfIn PDF document text
- http://thenext.pk/userfiles/files/93790040336.pdfIn PDF document text
- http://plkorea77.com/ckupload/files/80300313856.pdfIn PDF document text
- http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeda6809c1---vavekepajutufupelaza.pdfIn PDF document text
- https://fertilizergranulatorprice.com/d/files/jejipodorapedos.pdfIn PDF document text
- http://autosoftware.company/autoresponders_images/files/13273183399.pdfIn PDF document text
- https://mayxaydunghoangphuc.com/userfiles/files/ravamo.pdfIn PDF document text
- https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/3f6spqicgsqk1lsj746j57rsii/dazosikavezi.pdfIn PDF document text
- http://captaincook.hu/userfiles/file/5483899253.pdfIn PDF document text
- http://varanini.pl/userfiles/file/29096684355.pdfIn PDF document text
- https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/xuxugejano.pdfIn PDF document text
- http://alarcon-v.com/editor_upload_image/file/13469601368.pdfIn PDF document text
- http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8bb0b476---9441003212.pdfIn PDF document text
- http://nandishoverseas.com/UserFiles/File/kumijepeki.pdfIn PDF document text
- http://cityfate.com/files/files/nuwiziden.pdfIn PDF document text
- http://gerocuki.hu/user/file/sefoviloxafenagexozeruf.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/14ev2pgsdjh9mngfhm6sr485u6/xaxafekatafub.pdfIn PDF document text
- http://satisfytech.com/ck/upload/files/6652727087.pdfIn PDF document text
- http://beautybybelief.com/admin/images/file/loruzipeva.pdfIn PDF document text
- https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/8vtsmgl28nd55irit1g0hdfubr/wewebozevujolakukoki.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4513ede7---kirisokul.pdfIn PDF document text
- https://johanbjerke.se/userfiles/file/bijanafezezi.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/je20uhabc8h39vfu5irn9s2iuo/rewumuv.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798c000d4bf---45131040383.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_off0000f4d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010ce6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CE6	17976 bytes
SHA-256: `f4d7830d7a01073872509ecef3c52e920792c159d09ba1a5f90e4c2571b1314c`
`font_02_sfnt_off00013bd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13BD4	11052 bytes
SHA-256: `ec0f3b1c039981a627f1d2773656d35d452a516692e56e00d117bd166619ac63`

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