PDF malware analysis — malicious · 762c76a7c3e027cb

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 03:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 636f38f1f29e495aad97251227ced686 SHA-1: 246ec9b89c1844b47c6ce544c480f418ab5c1c3c SHA-256: 762c76a7c3e027cb3d4f71bfc03cf0ece39260038b464d01b28a96e8e0c3573e

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. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or exploitation.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=ncert+biology+class+12+chapter+16+pdf PDF link annotation
- https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fae22e54ee2fdbdf0276c3e5727fdb61/zevavobupul.pdfIn PDF document text
- https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/91ouic45q01lu8neunnhbb1r15/nowelunajimasibezixat.pdfIn PDF document text
- http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7804b673d6---71996117327.pdfIn PDF document text
- http://ibookingkr.com/FileData/ckfinder/files/20210731_6554DB06F3B720C0.pdfIn PDF document text
- https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/e6nmamgkapl3tv8l76ds9a87e4/50867016351.pdfIn PDF document text
- http://ipublicity.cz/data/file/limomajik.pdfIn PDF document text
- https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/di2l7h07mfj1q552k7bb238bst/saposubaw.pdfIn PDF document text
- http://inventory-acepipe.com/images/uploads/files/93600758679.pdfIn PDF document text
- http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798f4366cb5---55027831157.pdfIn PDF document text
- https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvf6p1vjglfvloov6bi4tc7338/90575846422.pdfIn PDF document text
- https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c88a3947b3b---11950434458.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2bd5a474---29486254974.pdfIn PDF document text
- http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c73614bfe37---jubesuzadifolotugeravexa.pdfIn PDF document text
- https://art-lamps-rali.eu/files/file/85704484023.pdfIn PDF document text
- http://anipetkingdom.com/webroot/img/files/pulej.pdfIn PDF document text
- https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/09e3ae43db7d636ac2aa8720fe86ef7a/81085159733.pdfIn PDF document text
- http://autoservizimensi.it/images/fck/file/43494444827.pdfIn PDF document text
- https://soalmatematik.com/userfiles/file/jasixojajizekuda.pdfIn PDF document text
- https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b857fad4cbb---80195336350.pdfIn PDF document text
- http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e7e324bd2---96656066521.pdfIn PDF document text
- https://lysgaards.com/ckfinder/userfiles/files/11820004862.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ad2e7b18---meliputoritanadino.pdfIn PDF document text
- http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/lfnce03hrkooafjv812q13bial/lolazafumalugabimosikexu.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_off0000f471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF471	11368 bytes
SHA-256: `ea57a4683d6311c5c0dcea5a2c1cb20d5e5133645bce066e8ccd42906678321d`
`font_01_sfnt_off00010f0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012721.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12721	17968 bytes
SHA-256: `c424f33ab02813b91cf90aa943184610ca596a368843833ab616152f3495c968`

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