PDF malware analysis — malicious · b9f1819e03140668

MALICIOUS

PDF

74.0 KB Created: 2021-07-02 02:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 79a777bed4db0c46bc0d1fe46e8dac8d SHA-1: e395676f480781c4efafc53c6056a934ffaa8d14 SHA-256: b9f1819e03140668d70f3a9d5bc17a4b28d581d094654d1a7b0a95e53990fe7e

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious workflow.

Machine Learning

Nyx PDF Classifier malicious score 0.9837

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://inwebjor.ru/uplcv?utm_term=wallpaper+full+hd+lord+shiva+images PDF link annotation
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44efec654---kopubixogova.pdfIn PDF document text
- http://littlepearlspublishing.in/data/eimages/file/75470637975.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c1211cc0f---13258314641.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6cd12e3960---9408108302.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c991179f0d0---kidesibedumikujidosekojo.pdfIn PDF document text
- https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/48b574714f6476697fdc33a9ac9cfd5c/suvajomare.pdfIn PDF document text
- http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/4de3fd3aca27385536a6ea27f2a84018/8718182875.pdfIn PDF document text
- http://accessprecision.com/userfiles/file/samukomorizanosix.pdfIn PDF document text
- https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/de67487287e0a73490e6a0b70ccb6490/58375419885.pdfIn PDF document text
- http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f83b4c15c---37425759630.pdfIn PDF document text
- https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/t6mj52tmehml3rhh5ijtmbucs9/jasuzexawavobug.pdfIn PDF document text
- https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lhg252j37u00od5qrufvfk32t3/54346704628.pdfIn PDF document text
- http://kalmi.ru/upfiles/files/83588943495.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d625e5baa---99338134374.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b285545252a---pasiwupiweluku.pdfIn PDF document text
- http://nickels.design/ckfinder/userfiles/files/23411734971.pdfIn PDF document text
- https://publicbridge.pl/userfiles/file/7411545581.pdfIn PDF document text
- http://phutungvespaco.com/luutru/files/pamubusoxonabiwa.pdfIn PDF document text
- http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d479c274---5683497808.pdfIn PDF document text
- http://thuexedanang247.com/uploads/image/files/vigon.pdfIn PDF document text
- https://avela.md/userfiles/file/4118456792.pdfIn PDF document text
- https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2lsi5k4j8e4ueeobongqrapre7/2255147461.pdfIn PDF document text
- https://area5srl.it/file/zakixo.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160783becd3d26---motutezelen.pdfIn PDF document text
- https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ed4865b60eef4453b80ef677ef499249/xagizogunar.pdfIn PDF document text
- http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f26622f21f---radibimosojiromupakawud.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1b4e0da35a08bc13586308bbb4be2b8e/jowokaz.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_off0000bf9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBF9E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d7b0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7B0	16120 bytes
SHA-256: `40725b3e8e7b88499ac54ea8bb718db475fc4b53863731a78b6003b61a4f2691`
`font_02_sfnt_off00010173.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10173	10904 bytes
SHA-256: `600c8d78b8a23e1ad8d8c8dad42093c07166a2e99d61e4e9d197067f404054a6`

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