PDF malware analysis — malicious · d2c295b0ca9435d0

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 00:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a3271d4a72eecb8e610c9aac95ca2afe SHA-1: 533b4937e83a6e9074dbfcc8ae50ac973eaf4a22 SHA-256: d2c295b0ca9435d01a84eb6de5ec7a574b8b79c45cb09265cf5499ce25850e9b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs and embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure points to a redirection-based attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://oniceh.ru/uplcv?utm_term=manfred+lachs+space+law+moot+court PDF link annotation
- http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac909f3916e---14903439818.pdfIn PDF document text
- http://karat-dobremiasto.pl/userfiles/file/fafibu.pdfIn PDF document text
- http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2f138a612fe0fffe9ce8f944b77f4402/77019834844.pdfIn PDF document text
- http://computer-rudolstadt.de/upload/file/32249910793.pdfIn PDF document text
- http://ascensionchina.com/userfiles/file/gazusuwitexegaxupinu.pdfIn PDF document text
- http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073a20a3c8f7---85179675958.pdfIn PDF document text
- http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210612045329.pdfIn PDF document text
- https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1a50ec7d0bd8451f4be5c9b943cfea51/98245776144.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ones40snkcd9scpjv93u72k7u3/pevisabisogetif.pdfIn PDF document text
- https://tipresentoio.it/images/file/boradasosegerewixasuzis.pdfIn PDF document text
- http://bensonlandscape.com/editorData/file/91275423031.pdfIn PDF document text
- https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ff876db915224436dbce1cab8a776ecd/bumutolil.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4707c7beea---77283105330.pdfIn PDF document text
- https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e1f8294bb564b97eebe322c39f3a48d/rawufekenonoxu.pdfIn PDF document text
- http://aarogyamedico.com/userfiles/file/ratamigenodusinedebuvixor.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/chi4bcv6a6cbup1u698jldooc0/14660355273.pdfIn PDF document text
- https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d5863384---99902495362.pdfIn PDF document text
- https://annjulieskarpmo.com/userfiles/file/betikudamevifazip.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827417de895---83380910881.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/vijelidixelafivin.pdfIn PDF document text
- https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bac877a411a---85479495841.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe85feb341---ledomuwanubodogi.pdfIn PDF document text
- http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85f3ceeba---putusoluz.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/310541ceceeb014eacbc9f668d838ee6/66383958357.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_off0000ea3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA3E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010255.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10255	10972 bytes
SHA-256: `5b6abb21016323ddfcaa70dbbd1fbc24a55853d78813c9858e8f97c26ab020aa`
`font_02_sfnt_off00011ba5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BA5	16472 bytes
SHA-256: `c65b95abed0ca30e81da8989a30272b8673b7853a81831f22ad129720ce08e8a`

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