PDF malware analysis — malicious · 106dc6531f36cfb2

MALICIOUS

PDF

78.2 KB Created: 2021-09-01 22:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 49acadf0535eba22d30ac754c07ddc16 SHA-1: 7dedb12e6dbf7d431a38c3017cbe9833c57b3cd9 SHA-256: 106dc6531f36cfb28453b4f207f67681df4782cdb92beb0328b685365a5516d3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites hosting further malicious PDFs. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users into downloading additional malicious content, likely for credential harvesting or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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=57+cm+to+inches PDF link annotation
- http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea54b246a6---tunirexes.pdfIn PDF document text
- https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6p36clnppd3e50foidougj00h4/371570564.pdfIn PDF document text
- http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0b71e170c---majutovipise.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/kmcn91or617htphec1a1t2csd2/purorave.pdfIn PDF document text
- http://expertsystemgroup.com/file_media/file_image/file/lowubotopep.pdfIn PDF document text
- http://centralcogtc.com/uploads/file/37786004677.pdfIn PDF document text
- http://studiopignotti.it/userfiles/files/54966380482.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160785babceb09---86795413007.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160789c54cb80c---nowanomekaw.pdfIn PDF document text
- http://dhf-china.com/d/files/33160859978.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac31dc7a7---8317607711.pdfIn PDF document text
- https://hoakhanh.vn/uploads/image/files/80969605959.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16109fd807380e---5716339183.pdfIn PDF document text
- http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a86599bf---lovuditiji.pdfIn PDF document text
- http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749fc1c9e03---gelekaxakemugezojekibives.pdfIn PDF document text
- http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/96797517733.pdfIn PDF document text
- http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80556121529.pdfIn PDF document text
- https://alkalacarservice.com/public_html/userfiles/file/damuzudiridikiful.pdfIn PDF document text
- http://macautemple.com/userfiles/file/xowupu.pdfIn PDF document text
- http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f57474181---xosekir.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1387b3de3---11548048907.pdfIn PDF document text
- https://tideandtigers.com/ckfinder/userfiles/files/momozakatibiravezuke.pdfIn PDF document text
- https://shieldtech.cz/ckfinder/userfiles/files/wasapaxiduxa.pdfIn PDF document text
- https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/284c4809c129f41289c2d2c8bd9f25b2/34810202181.pdfIn PDF document text
- http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/be9vaacabkpsai3c8ss1dvojc1/bofigigorinorijugojadeja.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_off0000d193.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD193	16448 bytes
SHA-256: `dc4a9c0cea68305b1c5f6d8722ebeb98ec49fa3abc98427aaad7f852c757bf73`
`font_01_sfnt_off0000fc32.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC32	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011449.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11449	10272 bytes
SHA-256: `083faf9c673a05583f6003845fc3e4fd43ec7a504baf937e5ba1c9e88d68129c`

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