PDF malware analysis — malicious · 334933ce3fe527d9

MALICIOUS

PDF

86.3 KB Created: 2021-07-04 14:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 524863d36a55aeefe57b9e1140d3e8dd SHA-1: 38adf444de75b9067b29c758522502512fc4f63a SHA-256: 334933ce3fe527d9a457b5259f645020b7d63bc63260caf1cae84978ea4654a8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. These links likely serve to distribute malware or facilitate phishing attacks.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=what+is+denatured+alcohol+used+for+in+painting PDF link annotation
- http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609ae1c1442f5---60036186357.pdfIn PDF document text
- https://itexpertdog.com/upload/files/39747040250.pdfIn PDF document text
- http://zoltysnieg.pl/pliki_wyswig/files/kofojelapapajorukax.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160747c9d4bb69---84919731643.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3bb97b5e---35796600785.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d2ccb7975c2f6a4c3ababd2c34d465f8/sukilaso.pdfIn PDF document text
- http://mdsalon.ru/img/lib/file/87061183543.pdfIn PDF document text
- https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2f2p2m1na7dujov8ehg2kjvj56/79123021651.pdfIn PDF document text
- https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cabcee4ba---78936052093.pdfIn PDF document text
- http://4grd.com/cmsimages/file/17491348049.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bea41061531---7518702874.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4u7jnqlr9jl79vavd28fqecal0/jujitufuvuf.pdfIn PDF document text
- https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae229f379fc---gorogovikilibenif.pdfIn PDF document text
- https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d738ef3f631---migepasukifin.pdfIn PDF document text
- http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8769cc3303---12852839223.pdfIn PDF document text
- https://hzautomatisering.nl/userfiles/file/43207503188.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7750348a---66240166127.pdfIn PDF document text
- https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/cfbe855c6230a9161d3ca104743e15e6/winukadezezirugosis.pdfIn PDF document text
- http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160887e85e5b9a---90496182439.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7e812b917602674887d1f569dfd84296/vasulaxevimijaxeweper.pdfIn PDF document text
- http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb1158d63---zanewomematirutewi.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9a3ddc8302189ee41be4566f1c76704a/vomuvukuzagurofidibuzew.pdfIn PDF document text
- http://liburnia.pl/userfiles/file/zuxuxi.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_off0000ee72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE72	10992 bytes
SHA-256: `ff537ddb1eab54b738ab33cac5fd6e00887a9597b65df9a5cb275139745ee397`
`font_01_sfnt_off000107ba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107BA	16968 bytes
SHA-256: `a335c9e1d00b29001cabc58c43ffd2391726dc06c7d205d5b6e62d26778f3ca2`
`font_02_sfnt_off000133cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133CC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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