PDF malware analysis — malicious · 9e437f6a7f96f098

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 15:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: f2b25ef6c593942dd5651db5db03c550 SHA-1: f44c5d16f44676e2184331250fe24a4fd32fcc42 SHA-256: 9e437f6a7f96f098e212a9b1d9ba662a4065e98170bddf3dd0dc5dee95ccbc45

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

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://binarbaidservices.com/public_html/userfiles/file/98842529457.pdf In PDF document text
- http://pilot-market.ru/new/files/file/direduzakaw.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28f6651538---xinatipoleripagalenotepa.pdfIn PDF document text
- http://2478.ru/admin/ckfinder/userfiles/files/38232237207.pdfIn PDF document text
- https://iwnta.com/userfiles/file/daluz.pdfIn PDF document text
- http://glovimex.com/uploads/ckfinder/files/29179340535.pdfIn PDF document text
- http://arc-en-cielproduce.com/ckfinder/userfiles/files/zijuwologoj.pdfIn PDF document text
- http://novelinternationalschool.com/ckfinder/userfiles/files/89528128465.pdfIn PDF document text
- http://siciny.pl/userfiles/file/10281321835.pdfIn PDF document text
- http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb78c0757a---baxigifuxurif.pdfIn PDF document text
- https://sieuviet.net/webroot/img/files/7426786812.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tqbei4g22go187hhu06dn73ka6/17664909459.pdfIn PDF document text
- https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1b5b39dadac7526925e5d591f4088ac3/gonipa.pdfIn PDF document text
- http://bangdientunhk.com/upload/files/ferujuxafikon.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc4b3775ee---niwopisupofovezimivela.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/lekikepizovuvirulusodom.pdfIn PDF document text
- http://say-international.eu/userfiles/file/82895285379.pdfIn PDF document text
- https://optimustelecoms.com/ckfinder/userfiles/files/84653248391.pdfIn PDF document text
- http://beateromer.com/bilder/file/54665573015.pdfIn PDF document text
- https://terminal.hr/userfiles/file/loxabezowuzuzukagesawapu.pdfIn PDF document text
- http://0-50.ru/userfiles/file/siduvuweku.pdfIn PDF document text
- https://jmcoverseaspvtltd.com/uploads/files/revowabomolazorutip.pdfIn PDF document text
- https://xeroxexpres.cz/userfiles/file/lagina.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a76af112---94740558729.pdfIn PDF document text
- http://avesta-hmora.boj.se/uploads/userfiles/files/zufotikonisoxok.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=number+10+worksheet+preschoolPDF link annotation
- 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_off0000db06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB06	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f318.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF318	17504 bytes
SHA-256: `4dc149b117e4939895edec832d399e4bdad2ad97fb60864fdac65f46e295d340`
`font_02_sfnt_off00011fe5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FE5	10848 bytes
SHA-256: `38a25d32dfa5deeb3447d25c395e9ec736e7cf52c16649da5f96cb7a304fb049`

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