PDF malware analysis — malicious · c06d4920590d14d2

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 03:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 533dd24a73c9db963e0fbfd8312bfebb SHA-1: e85c9a6e4fda7f2c9b8ed678f7294e3b835d232a SHA-256: c06d4920590d14d25d38c3258bdbbdda3f840bd3df3274397f25fcaa19bc5c6e

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the presence of numerous external URLs suggests a phishing or malware distribution attempt, likely involving a second-stage download. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://drafthe.ru/uplcv?utm_term=beste+tastatur+app+android PDF link annotation
- http://musorcentrum.hu/files/article/file/25930160610.pdfIn PDF document text
- https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/57f243bfc6f5bf05bc6ab143bc1b1d99/77831960875.pdfIn PDF document text
- https://felicitareonline.ro/ckfinder/userfiles/files/41365848371.pdfIn PDF document text
- http://burragebrothers.net/demo/jolie/beta/userfiles/files/2537747704.pdfIn PDF document text
- http://finchamauto.com/pics/97313022059.pdfIn PDF document text
- http://palletgoanloi.com/img-dn/files/92969309165.pdfIn PDF document text
- http://jujucuisine.com/userfiles/file/90523144576.pdfIn PDF document text
- http://dyglas.com/userData/board/file/29961185728.pdfIn PDF document text
- https://egokituz.eus/files/galeria/files/febiv.pdfIn PDF document text
- https://srinivasagroup.com/ci/userfiles/files/ganal.pdfIn PDF document text
- https://cplastik.cz/data/cms/file/wixorinapovofej.pdfIn PDF document text
- http://erbaytag.com/resimler/files/fepovobififumov.pdfIn PDF document text
- https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d12d7ad2d---poripad.pdfIn PDF document text
- http://american-security-inc.com/assets/ckfinder/userfiles/files/93119185908.pdfIn PDF document text
- https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/gagerakuk.pdfIn PDF document text
- http://desiaussies.com/ckeditor/uploads/files/70847008327.pdfIn PDF document text
- http://nbc.com.vn/ckfinder/userfiles/files/10986950203.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142ad7bf3555---83631763807.pdfIn PDF document text
- http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xarepizijes.pdfIn PDF document text
- https://raljob.com/userfiles/file/8663955151.pdfIn PDF document text
- https://fceresources.com/ckfinder/userfiles/files/3394187971.pdfIn PDF document text
- http://thebookmarkcafe.com/uploads/files/vogotarapiz.pdfIn PDF document text
- http://vietsonplastic.com/uploads/userfiles/file/6187996046.pdfIn PDF document text
- http://agedwedfjtj.pretty-match.com/upload/files/752067883.pdfIn PDF document text
- https://zlatartopalovic.rs/files/xanupibeti.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_off0000ced2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCED2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e6e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6E4	17212 bytes
SHA-256: `39d56cb87cf56660a045a59f9c3b0140b4ff67e59717bff533b0ddde813b0e76`
`font_02_sfnt_off00011358.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11358	10492 bytes
SHA-256: `1b112c983cbad5a08e654a189424588c6898d7930d21e001d4d9a5e71b2bbee6`

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