PDF malware analysis — malicious · 67983ea154b5a5b3

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 11:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9b41084f92a71947ffb7b50e0932e53b SHA-1: 2aa8dbfd9e8b8949cd3b49967634f376acb176b9 SHA-256: 67983ea154b5a5b33db451ba624087030474eaef2a4d1c39907be4c54e8a4f21

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather to host malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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=navodaya+teacher+recruitment+2019+pdf PDF link annotation
- https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716a1347079---mudijerisogenet.pdfIn PDF document text
- https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/83f4466f6e926a36c706358b4c0b563a/36162330995.pdfIn PDF document text
- https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/b2487c1af7c3f8bf35ecd9f0fc0fb412/71125179270.pdfIn PDF document text
- http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109ee7960a1c---bakefe.pdfIn PDF document text
- http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16108c2035d6be---80039711521.pdfIn PDF document text
- http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab89ed5fcf---46980825254.pdfIn PDF document text
- https://www.blondel-bois.fr/ckfinder/userfiles/files/pumuwitu.pdfIn PDF document text
- http://henca.com/files/details/file/66548137806.pdfIn PDF document text
- http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abfb82246a0---54258927641.pdfIn PDF document text
- https://patriciobanados.cl/upload/file/In PDF document text
- http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdf443dfc---xalumexebasepeg.pdfIn PDF document text
- http://alemotta.com/resources/original/file/96156333263.pdfIn PDF document text
- https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/527bddb5e2a9cbecba51f59fa0f178e2/26570352418.pdfIn PDF document text
- http://softtox.com/new/userfiles/file/72650789792.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/d77ff957a3e87f4ea5b441ca8498ffe5/91868445533.pdfIn PDF document text
- http://galsabino.it/userfiles/files/sulogebojaditurebisove.pdfIn PDF document text
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e43c729---sulumenamaxigesadapav.pdfIn PDF document text
- https://netcsemege.hu/ckfinder/userfiles/files/laboma.pdfIn PDF document text
- https://daaeportrett.no/upload/file/kasofujosizogodutafa.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/11ab37ca9bd2c8ec8df2d8080dce274a/kinobivugejidoru.pdfIn PDF document text
- https://iqmuseum.mn/uploads/files/jaxugupamixog.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/gotuwajobejipib.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161035cc94118a---35141366823.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a696f5adc52---wonexon.pdfIn PDF document text
- https://budapestpainter.hu/ckfinder/userfiles/files/50256423427.pdfIn PDF document text
- http://samafb.org/uploadfilefiles/16025835319.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_off0000ce20.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCE20	18736 bytes
SHA-256: `d4a23e8cb0104bedd8abb573a55d8ed046b541c1e62a2930f51ce76999f1b020`
`font_01_sfnt_off0000fec0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFEC0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000116d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116D7	11388 bytes
SHA-256: `fb5be06c52bbca2542f69717e73f778a04d170003b9c54764aa57664ecf06dd2`

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