PDF malware analysis — malicious · f0cc08c5a9fbbbe2

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 18:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e6c0a18c50ad6a96bf86a096f4062837 SHA-1: c4c91ccb953fcd4328c68c74840ce4337375faa2 SHA-256: f0cc08c5a9fbbbe2ed2d91ce3ada7acd7d242fba8e256e48c1d9e269a254e445

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. These links are likely intended to redirect users to malicious content or phishing pages. The document's structure and the nature of the URLs suggest it functions as a link farm to distribute or host malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://wastran.ru/uplcv?utm_term=guyton+fisiologia+pdf+ita PDF link annotation
- https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/851e14812971ab44d74e955e390f7fbf/xepeloxemunezi.pdfIn PDF document text
- https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rhabq24oeidm2d6ttrl8npeet5/tuvafe.pdfIn PDF document text
- http://topup-fight.com/ckfinder/userfiles/files/korejoluwuk.pdfIn PDF document text
- https://yaofangpeixun.com/upload/files/23593119280.pdfIn PDF document text
- https://securitegenerale.tn/userfiles/file/93155557343.pdfIn PDF document text
- https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87638cc21---98826609387.pdfIn PDF document text
- http://www.tomasjelinek.com/img/pub/file/42520969241.pdfIn PDF document text
- http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3dc583a2820a05bdf445e1230c11bc60/12357799077.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ei5baffbt6nktpo5c5dkbphil9/25389293596.pdfIn PDF document text
- https://rijst.nu/userfiles/file/12170192045.pdfIn PDF document text
- http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc1c4e86c84c218e4a3f4c879096c468/8449754617.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/roripoxeko.pdfIn PDF document text
- http://dribblebar.pl/userfiles/file/dalavasuposukofozulutan.pdfIn PDF document text
- http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d73a2b498---18122654846.pdfIn PDF document text
- http://ahkjt.com/upfile/file/tajudawumo.pdfIn PDF document text
- https://clubelsendero.com/img_pag/file/67520179948.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/96b201fa7920cb16feba1da2ca3bcdb9/7613307815.pdfIn PDF document text
- https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ca09571a989928cd55c2a417c1366d59/48659948734.pdfIn PDF document text
- http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075099e807ac---wamozupu.pdfIn PDF document text
- http://meadescafe.com/userfiles/file/6926423452.pdfIn PDF document text
- https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/12b05d41cc913e1485ae467569ae9574/kavavofikudepidawo.pdfIn PDF document text
- http://szamosiszerviz.hu/feltoltott/files/48244795931.pdfIn PDF document text
- https://taksis.lv/taksis/userfiles/file/lejon.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d26cdd070068ee5d8b4716a2d84f5734/49608823338.pdfIn PDF document text
- https://gamaconsultores.cl/upload/file/24601359927.pdfIn PDF document text
- http://spl-designs.com/ckfinder/userfiles/files/soronafisenedidad.pdfIn PDF document text
- http://stellamaris.cz/userfiles/mupura.pdfIn PDF document text
- https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608689662a05e---87056729951.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_off0000e20e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE20E	18364 bytes
SHA-256: `33a38f92b70267d8e0d875e65c4ca641669617f0d91252b41fe525b7546c30fe`
`font_01_sfnt_off000111e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x111E5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000129fc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x129FC	10696 bytes
SHA-256: `56b71908865ffac4934928ae7cd4d8c0d9a1f7da3bcad84e05d0dbe0f4c5dd15`

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