PDF malware analysis — malicious · fa39e79d576729d0

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 08:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: f8610765abfa9bcaa609e756091a5a96 SHA-1: 5309127fb0732ee9c049ddeca6dcd00237359047 SHA-256: fa39e79d576729d0ea579ee7efe1b2b842ef7ec8749446996c8a17f0cd5cd69e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or credential harvesting attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9970

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://medvor.ru/uplcv?utm_term=opposite+of+sweet+in+english PDF link annotation
- http://msiutilities.biz/documents/393738847.pdfIn PDF document text
- https://jordanadams.com/ckfinder/userfiles/files/84041804387.pdfIn PDF document text
- http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609df433201bd---649427907.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ahhnabe3rdc9ko7t911o52qvmc/92034423019.pdfIn PDF document text
- http://vodova51-53.cz/files/kafobubikuzekoseb.pdfIn PDF document text
- http://www.lnk-creation.fr/upload/file/34692927777.pdfIn PDF document text
- http://kpotplace.com/uploads/files/zirujukelapobofazolajojiw.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f2994c942---9395357688.pdfIn PDF document text
- https://biholka.cz/uploades/userfiles/file/gixuzoxuberazel.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9996b2369e---8180314956.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qu3qlbtbld09d7upsubpqpklg0/balolapekulowivifu.pdfIn PDF document text
- http://immodraft.de/images/architekten_agentur_images_/file/palimuzuti.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/2ba06a87f65433771802e32e010813eb/99425967879.pdfIn PDF document text
- https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3397b1300f96357c6f534779b9076658/zopomutexodupinig.pdfIn PDF document text
- https://artcorner-fiberglass.com/userfiles/files/tikexanedulawudetiwewop.pdfIn PDF document text
- http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/889f96cebcd5456f96fa340b41083ad9/38130377766.pdfIn PDF document text
- http://damutech.kz/upload/2021/08files/210815175214544563vg3h9.pdfIn PDF document text
- https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af77e1db213---rupexerolubiku.pdfIn PDF document text
- https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/79a128a77f7bbc06226cacf2ce7d5e2b/nepobunivabizulerewavu.pdfIn PDF document text
- http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160760eacd833f---9900733135.pdfIn PDF document text
- https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jikedajezosutoluronezesi.pdfIn PDF document text
- http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/30648606427.pdfIn PDF document text
- https://aquafilling.com/userfiles/file/64812078581.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8b3ce2f827afc0435eaf1fc4ab0bd87e/luwazas.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_off0000fc91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC91	10484 bytes
SHA-256: `f6d6f605382b6d76e628897f8ec675f7c58a586e447aef92fb78ab49883b3c35`
`font_01_sfnt_off0001146c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1146C	19060 bytes
SHA-256: `45890586362208b30fb5d9a67b3e550ecbd1b8937d43e9af19d670855ba464f3`
`font_02_sfnt_off0001455d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1455D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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