PDF malware analysis — malicious · 1c4bc334fb2d35e2

MALICIOUS

PDF

74.4 KB Created: 2021-06-29 13:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a9615101fa31d5c0936f172d4a0ae428 SHA-1: 371ba88df7876545bb881fd8a44db24300022819 SHA-256: 1c4bc334fb2d35e2a4f1ac35cd5b538fe9e7bd4774370ef1a9ef1ec0a9f526ed

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. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9827

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://allytemp.ru/uplcv?utm_term=the+farmers+butcher PDF link annotation
- http://scbczy.cn/up_files/file/20210628_054518.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5cd847c486d507f3b4ebdac1a28b5f38/fosogarage.pdfIn PDF document text
- http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7902419e---jemukolojoweb.pdfIn PDF document text
- https://keralahappyjourney.com/ckfinder/userfiles/files/33844720137.pdfIn PDF document text
- http://studiotecnicomartani.eu/userfiles/files/kemazaxeziwavimotowukirif.pdfIn PDF document text
- http://v-lukomorie.com/uploader/files/79606209079.pdfIn PDF document text
- http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o14d7nosco67e5ntergk2vnld5/sevokajawivusaluziki.pdfIn PDF document text
- https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b6a847a18---wubidetaxibukerujul.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/9431449723.pdfIn PDF document text
- http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918fb1bc683---19215068474.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/345b4674308781e7316070a2be1eb85c/79621138927.pdfIn PDF document text
- https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf905e01498---tewerori.pdfIn PDF document text
- http://28777886.com/Lpf/UPFILE/userfiles/files/xirim.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a34f7d241833b44f734fc2cbb92d599e/loxizusiduxukor.pdfIn PDF document text
- https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/34e9eff54688f5254bd4151e4df21f91/75535882880.pdfIn PDF document text
- https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900cf4be802---13968267131.pdfIn PDF document text
- http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/75786247389.pdfIn PDF document text
- https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3e793c6ea93b1325cf9afba69c44f19/11725164221.pdfIn PDF document text
- http://meble-tk.pl/userfiles/file/vesutuwef.pdfIn PDF document text
- http://bygreenpure.com/userfiles/file/gekujojotuka.pdfIn PDF document text
- https://rosenstein.lu/userfiles/files/80569906069.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a7fc52cd8a6f113007e8525b9b837b60/18985394843.pdfIn PDF document text
- http://chromavials.com/d/files/rejesadulukaluwosarajan.pdfIn PDF document text
- https://amatnieks.com/pictures/image/pavunavovupaxezezo.pdfIn PDF document text
- http://speaklifeiamgreatness.com/files/files/45472825593.pdfIn PDF document text
- http://nguyenquangcomputer.com/upload/ck/files/79691608660.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6023801c9b---21507162832.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_off0000c0ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0CE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d8e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8E5	10444 bytes
SHA-256: `04934528a801a22b02abb0415b9665bed68c59dd5c70558c7c0b98d431ce1fec`
`font_02_sfnt_off0000f0a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A2	16744 bytes
SHA-256: `759225e25153c917b6d5d490599af276572c1a25bc988a91e638806307f374bd`

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