PDF malware analysis — malicious · cf2285e7e8f29392

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: b2c7bf372ed4fc1396b1860333c6c6c0 SHA-1: 72b663190ade607828d5ad0e1d27bd2ed43acb1e SHA-256: cf2285e7e8f29392cda23fe1ca030d235f88ea77e1f014adfc49e8e4f02ccfe2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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 http://comp-art.ru/userfiles/file/laweb.pdf In PDF document text
- http://cauthangdep24h.com/upload/files/1630134024.pdfIn PDF document text
- http://ceresasrl.it/userfiles/files/98684525480.pdfIn PDF document text
- http://euroear.eu/ckfinder/userfiles/files/rimitebumupifutuvukisosam.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/xajasomak.pdfIn PDF document text
- http://telegid.tv/userfiles/file/93596685174.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3b20d7ef95b0a002d8ef8dbdd10f2dee/fibodabapugazesokoj.pdfIn PDF document text
- http://benly-carson.com/product/files/2696609386.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141177775d31---sunotejukoso.pdfIn PDF document text
- https://fibra-optica.ro/ckfinder/userfiles/files/86770270260.pdfIn PDF document text
- http://old.smartplus.pl/ckfinder/userfiles/files/77522953396.pdfIn PDF document text
- https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea7b9449e---34808085472.pdfIn PDF document text
- https://flardochform.se/userfiles/file/1007238568.pdfIn PDF document text
- http://yasairamenbar.com/uploads/files/93736618821.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d38d5c504f78fb6f9568c9b9586b0fb9/60751621256.pdfIn PDF document text
- https://mallncart.com/userfiles/files/sixiwuzexetas.pdfIn PDF document text
- http://saiprogetti.net/userfiles/files/wopomefakup.pdfIn PDF document text
- http://33podarka.ru/pictures/files/38968786308.pdfIn PDF document text
- http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/666ed166ddba014c024f9260b226e0c8/24062057339.pdfIn PDF document text
- http://baltic-rt.ru/ckfinder/userfiles/files/19176156457.pdfIn PDF document text
- https://www.colline-eternelle.com/ckfinder/userfiles/files/xevalagiretefozide.pdfIn PDF document text
- https://motodubai.com/uploaded_images/files/21003344341.pdfIn PDF document text
- http://cachnhietwin.com/luutru/files/robuxikepitakopigodibidol.pdfIn PDF document text
- https://motodubai.com/uploaded_images/files/45284043539.pdfIn PDF document text
- https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/j2qa9m318pq9ainie3sfvgbh97/95059337179.pdfIn PDF document text
- https://botroul.be/uploads/59736200314.pdfIn PDF document text
- https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t63llhffq69c4kejkbrl22bmj4/punakeluwa.pdfIn PDF document text
- http://another-partner.morefriendship.com/upload/files/24368630719.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=optimizing+app+meansPDF 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_off0000de06.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE06	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f61d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF61D	10412 bytes
SHA-256: `27ba700497f182c15b0229c1ccd96e353926faaf07383f04f3c32e37bfcf5ccb`
`font_02_sfnt_off00010dd0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DD0	17908 bytes
SHA-256: `befb0ca0a5e16b429b058ed4f993ba169c319e4c38d2ce9eb1938d2966f563de`

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