PDF malware analysis — malicious · 13af817e1bd94015

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 15:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: 19ee28cc3c576453be938453b9a29eab SHA-1: 6eeb4388ef9290a5a8de2077682784d66e89f73b SHA-256: 13af817e1bd940159008d4d471a69deb73e47d97318e10a9ec36af6317aabd5f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to serve a malicious payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9989

Heuristics 6

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.
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://laborke.ru/uplcv?utm_term=impact+of+online+shopping+on+consumer+behaviour+pdf PDF link annotation
- http://dok-vo.ru/userfiles/file/dokufegubiret.pdfIn PDF document text
- https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2900c8fd---21760964107.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ed84e31b3---54490745834.pdfIn PDF document text
- https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e42184101ef13769a717576d7f5701c7/42497919826.pdfIn PDF document text
- http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fcdd55e3b---5404974404.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727ce06013b---47689324635.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa592eb149---lapekamu.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a3058118---82813565870.pdfIn PDF document text
- https://zoomkish.com/basefile/zoomkishcom/files/tuzujapinubuvexupaf.pdfIn PDF document text
- http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8469d2f00---pujine.pdfIn PDF document text
- http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7b6d9891---xanavelaridozetaw.pdfIn PDF document text
- https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/15ca394902bc2c938c9f69a39f530c2f/vagupur.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3a4a788aca18fe182d389b3ec33a443a/8979598906.pdfIn PDF document text
- https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a624075fb67---47513735153.pdfIn PDF document text
- http://ninda.vn/userfiles/files/tijinizokaboguropu.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/34747260096.pdfIn PDF document text
- http://kondicionery-noginsk.ru/upload_picture/file/gazewepuk.pdfIn PDF document text
- https://fainitelecommunication.com/public/editorfiles/file/lalibufubenitesuzi.pdfIn PDF document text
- http://olympusflights.com/files/files/59124337365.pdfIn PDF document text
- http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ecddb95e452484846a824586b6d375e3/kasegu.pdfIn PDF document text
- http://www.dismaplant.com/ckfinder/userfiles/files/sadukojizisa.pdfIn PDF document text
- http://eventologia.com/userfiles/files/nokomiko.pdfIn PDF document text
- https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9c7994895cc06c2f40903e2214d68915/runudozigefejakonizabozes.pdfIn PDF document text
- http://hotelniagararimini.eu/userfiles/files/94317526209.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_off0000cfdf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCFDF	17824 bytes
SHA-256: `ef94208380c2eb372c59da167839e6c7be2c7e97ba5763e60a618d016f866f01`
`font_01_sfnt_off0000fd6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011586.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11586	11324 bytes
SHA-256: `877721cad6319e171e46e4346131da33adf4aeaa58983b64ff246b6739629f3d`

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