PDF malware analysis — malicious · af5aed4c1dbe2244

MALICIOUS

PDF

87.6 KB Created: 2021-08-07 08:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b2499dcd7ffb3c5cfc497132cf9a2632 SHA-1: 8d02920b51122ea44a2993e9162496a499aac404 SHA-256: af5aed4c1dbe2244e943d343cd938b3c82273a7664e6d06e498f84ab7b0c4c57

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9972

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://infrive.ru/uplcv?utm_term=building+construction+pdf+notes PDF link annotation
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16096d0b4ec088---66256939972.pdfIn PDF document text
- https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/urj8lkgk19tc8rp4h9trssim17/43215321029.pdfIn PDF document text
- https://actor-conseil.com/files/file/ruwudodiwigawojejuxego.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086306e1d2e9---30184122478.pdfIn PDF document text
- https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/658648cb5a0c27b1a76feadf2c476599/45400680585.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e58ef267d3045d962f2b1a06290bea6c/33194252708.pdfIn PDF document text
- https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/viqmdngjm427eev0ukgd7buei8/pusadufezorujaj.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/q9ecqgjncb6g89fn4fur7tgfk4/pinunanabotopifefixarami.pdfIn PDF document text
- http://altelaw.com/uploads/image/file/79721767960.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/l26k0easut32ahguk2o3kfd5df/83503226144.pdfIn PDF document text
- https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/7uufi6uklie9f4icntdd6rsp19/situderijiwumalum.pdfIn PDF document text
- http://artospace.com/pics/file/kidenoritok.pdfIn PDF document text
- https://paperland.bg/uploads/file/rupavopazavuzaju.pdfIn PDF document text
- https://congchunghadong.com/uploads/files/letor.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/savivozu.pdfIn PDF document text
- https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d20a5720f6---85102298703.pdfIn PDF document text
- http://bioterapiazabiegi.pl/obrazy/file/43162288567.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/q783l41mev1relrrgcj7lbfh11/vonadarewadinugule.pdfIn PDF document text
- https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/406448659e1e6c96d468915fb451b42b/83534512379.pdfIn PDF document text
- http://haohanlegend.com/Uploadfiles/files/sivipu.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/81808952e9da5aada81c59d02a1528ea/zijenaworanisofinewasiv.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df36aede84---bezojirabogameva.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4914968c4---36613877328.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090a43b70a9a---75195387483.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_off0000f216.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF216	16948 bytes
SHA-256: `af9305fa03c4d16a3d0f1ca1c81be7b4cd755c0b78917b6f717b2f30106862d7`
`font_01_sfnt_off00011e5f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E5F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013676.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13676	10784 bytes
SHA-256: `e5a15ad01c47561b5d5c9c1664eb2547448d6a04a2fcd0cc74e0d077cfe9caea`

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