PDF malware analysis — malicious · 83efb08bca0563a1

MALICIOUS

PDF

92.1 KB Created: 2021-09-03 23:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 6c4d6898797a3499df28d6e579cf5fd0 SHA-1: 81c98c39ebf2a361d3bdce8f66f119894a4e2703 SHA-256: 83efb08bca0563a148d12e0aa4fc403c58329e1da32a1fc5e4e7738b037d4180

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9923

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=generac+5500+parts+manual PDF link annotation
- https://ei-hotel.com/free_images/files/52064860732.pdfIn PDF document text
- https://wolfgang-photography.com/userfiles/files/42941319808.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/fd31d26aa74300a37c0a4258bf78294a/25217732765.pdfIn PDF document text
- http://metaglas.kr/userData/board/file/82872175482.pdfIn PDF document text
- https://samsungklimalar.com/upload/ckfinder/files/lekitigepekepomas.pdfIn PDF document text
- http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741e18ea1b9---zukidomudotukafi.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbc74a919---jizupilegusosuviluben.pdfIn PDF document text
- https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160910428c6b82---83490626767.pdfIn PDF document text
- http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e11a9754473---40712637761.pdfIn PDF document text
- https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b863d412e79---jirevibapitikisotalak.pdfIn PDF document text
- https://advance-pack.com/editor_upload/file/vadok.pdfIn PDF document text
- https://iphastkala.com/userfiles/file/zofebomageluw.pdfIn PDF document text
- http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8afb8532b5---pinazorupag.pdfIn PDF document text
- http://ozari-ua.com/files/file/dalez.pdfIn PDF document text
- https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/8985ca48f48ef5b6205f0ed43241dbc9/34178647135.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f5c0cd2635ecc8d46611e393ab2f0c82/19215238798.pdfIn PDF document text
- http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160701dec3b528---53822790181.pdfIn PDF document text
- https://podereilmontaleo.it/writable/public/userfiles/file/pageviporelitaxofufavamex.pdfIn PDF document text
- http://mpu-beratung-brendle.de/userfiles/file/48764022181.pdfIn PDF document text
- http://n2nlah.org/UserFiles/file/48883387929.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/disevup.pdfIn PDF document text
- http://an-professional.ru/img/files/file/26246964958.pdfIn PDF document text
- https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/qni1kc24sqgo3rjdttpp21eqlr/82664212988.pdfIn PDF document text
- http://encino.kopanramen.com/uploads/files/bidofekumibagexa.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/02010bc6101f022c55a1bf2341b3078a/xulaboze.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off000141f2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x141F2	18868 bytes
SHA-256: `7f49cc5153c56447dc1faae9805e7e05e374625d935a6c251060878d3be194bc`
`font_00_sfnt_off0000e20f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE20F	18280 bytes
SHA-256: `5ab755e23fd8aa98c62d9d344fd4a004229a95e2313e54994fc0a0075b7e8718`
`font_01_sfnt_off00011126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11126	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001293d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1293D	10720 bytes
SHA-256: `e4fe2168dca23b6010ab3614574c7ced2d512748c71e3d12582ef33193ac4a36`

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