PDF malware analysis — malicious · a22ae5b0e6644336

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 9f3712811b99dc01e2f2a60d92183589 SHA-1: 57562281aa887b979c63f56c77a830a800c88396 SHA-256: a22ae5b0e6644336d6d1bd4e2f347f77cce48159beda19e0a61b7448bf92206c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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 http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddc742b4d6---54501185136.pdf In PDF document text
- http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b21f6df27a3---fudidetoxubajujo.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ab30e7e7d---2765331922.pdfIn PDF document text
- https://techson-cctv.com/upload/file/vopodosotexorokusu.pdfIn PDF document text
- https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/877a9174270a26eb6e0f7546a7a3dc7b/bedogowuderodolufid.pdfIn PDF document text
- http://www.novosib-sport.ru/ckfinder/userfiles/files/sikituzux.pdfIn PDF document text
- https://yoimart.com/upload/file/20210902142433.pdfIn PDF document text
- http://chiengthai.com/file_media/file_image/file/28398077342.pdfIn PDF document text
- https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/piacpo1rte2cmhh90vpcs41h3t/vesomaloduxetifimudusi.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/36a9a6cd0c00edd163d6846ea649a32b/17192953582.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ec596dee8a54cb88e73ea3335e8cb6e6/42585857932.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a22961e1b66---lapugedalitewajejapaxu.pdfIn PDF document text
- http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d9dfd7498d96526f9f51a75e40471cb4/8685865975.pdfIn PDF document text
- http://boekenwinkelindex.nl/images/uploads/32843579615.pdfIn PDF document text
- http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833b2808cb9---51971025959.pdfIn PDF document text
- http://naturalmis.com/userfiles/file/18723397624.pdfIn PDF document text
- http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2101744c8c0f15d1fcac14d41e814a71/jupizasakejefumamugevu.pdfIn PDF document text
- http://afghansolar.com/userfiles/file/39700109378.pdfIn PDF document text
- https://baxsporthorses.com/userfiles/file/gonuxebosekex.pdfIn PDF document text
- https://www.tunnel.de/files/uploaded/file/68234848797.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/83b2802052dcaf3e33fbf2a172612091/47605704160.pdfIn PDF document text
- https://humicdp.com/uploads/2021-07-10/images/files/21608095591.pdfIn PDF document text
- http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610305be98074---17063470773.pdfIn PDF document text
- http://kup-vino.cz/web/ckfinder/userfiles/files/midiwox.pdfIn PDF document text
- http://iehyun.com/editorupload/file/96318413421.pdfIn PDF document text
- http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16080b601aa974---22722665586.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160843e7f3b148---ximawasekutuwasud.pdfIn PDF document text
- http://ristoranteyuri2.com/userfiles/file/zolovazikusaxaraf.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=photoshop+cc+2017+save+as+pdfPDF 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_off0000eb00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB00	17772 bytes
SHA-256: `d83af810f299f40367eebdd45ff5cf3c52316cbb4f1d1636d749abbd90e549f5`
`font_01_sfnt_off00011979.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11979	10788 bytes
SHA-256: `e08d33c1776d1304f6d5fa93df6b79b6634dac398199bb84b55e15be85be418e`
`font_02_sfnt_off000132ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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