PDF malware analysis — malicious · 4c10b978db0c607f

MALICIOUS

PDF

89.9 KB Created: 2021-06-25 22:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 0e6630c1c1b7ed7c94e44d55f5be4453 SHA-1: 31a39d3dae6a621452671d45a4cba6947539afc9 SHA-256: 4c10b978db0c607f41891f4a348ce4ad57864a16a1c7be9da7e7e9b6a0bb1e50

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The primary attack pattern involves directing users to external, potentially malicious URLs, likely for phishing or to download further payloads.

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://ketchas.ru/uplcv?utm_term=how+to+make+pdf+a4+size PDF link annotation
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ec1e8cb6e6f715b48c0fa54420da07eb/49622013075.pdfIn PDF document text
- http://csc0898.com/userfiles/file/20210625072703_prp22u.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607767c8e032d---66349402023.pdfIn PDF document text
- http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8deb8266---31319781247.pdfIn PDF document text
- https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/7ktbni2h2ua6im99rqtg25rp48/65467375029.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7f6612e6d8e7a83265d3d70a5d18ebda/75807538511.pdfIn PDF document text
- https://treasurehunterdetectors.com/ckfinder/userfiles/files/11334141390.pdfIn PDF document text
- http://elite-nails.pl/Upload/file/73366238386.pdfIn PDF document text
- https://gtnet-engine.com/ckfinder/userfiles/files/46643773471.pdfIn PDF document text
- https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd73419ab53---43698132537.pdfIn PDF document text
- https://oncallanatomist.org/ckfinder/userfiles/files/84810686702.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e209e11cd1aa9a6bd430543f289ccea1/85222888455.pdfIn PDF document text
- http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c827ca2a3---bunifidozupunexajetid.pdfIn PDF document text
- https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/h83olaucj7h80s4qfjqviiscnv/talumafaf.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/deomn05hrb53991kqcrpt6bdv4/30093805851.pdfIn PDF document text
- https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/467652958ab5d05d10555aa318348c71/tikumuvanenegagipifalofes.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6io97mfp3s1dic486ava9qpao2/38040888812.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/442vabr6rc184f37uqpn6ot8e1/15421134677.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961addaf4f6---34809285120.pdfIn PDF document text
- https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff83c77ed---73410168867.pdfIn PDF document text
- http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5625e7ee3---wogebidugoberu.pdfIn PDF document text
- https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e387cad3f5---50244300158.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22703c63a---barajobufotijizok.pdfIn PDF document text
- https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fe90d99dbe412a3b3cb43495446bedb3/nepekivoferavodito.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pvhpi67au9ph5le79uj06c6j73/wugafiregi.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_off0000f701.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF701	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010f13.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F13	19124 bytes
SHA-256: `6cc24ca87ec3d3a9d8f28b606c851b3c0d107df84894feda36d6c9f2591e611d`
`font_02_sfnt_off000141c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x141C4	10716 bytes
SHA-256: `276cb6aea5b27e231f5f4ad485562407dddebe370d4b19eb27707acb00fda775`

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