PDF malware analysis — malicious · 5c8d9e8493ba936b

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 01:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 19f30a7d18325b3babc7f4e1abbdeff5 SHA-1: 12759abccd1fbfdbf2028418abc36a306f2b2767 SHA-256: 5c8d9e8493ba936bd1a7c0c0aa73de6dc60d434aaab6ef9254de6051d91ce96d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, presenting numerous URLs that lead to external websites. Some of these URLs point to compromised CMS upload storage, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://wastran.ru/uplcv?utm_term=picsart+all+unlocked+mod+apk+download PDF link annotation
- http://geasit.it/userfiles/files/56850081944.pdfIn PDF document text
- http://boardmark.com/files/file/58380641869.pdfIn PDF document text
- https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413aaa61b95---naxujiwedabebese.pdfIn PDF document text
- https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/disurunurenejumakegotozud.pdfIn PDF document text
- http://mylodge-naoshima.com/17874888639.pdfIn PDF document text
- https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba43a45802---49281088821.pdfIn PDF document text
- http://canhtoanland.com/upload/files/delujinegaditimebuk.pdfIn PDF document text
- http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/2747381679.pdfIn PDF document text
- https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/10508096174.pdfIn PDF document text
- http://dkkarsin.pl/img/upload/files/voladok.pdfIn PDF document text
- http://kleinschadenexperte.com/userfiles/file/13994846104.pdfIn PDF document text
- http://riskhedgetech.com/uploaded/file/2065909818614343978904f.pdfIn PDF document text
- https://truonggiangcompany.com/userfiles/file/fusewabadiz.pdfIn PDF document text
- https://ultralloy.net/upload/files/74221767684.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/1608efa9b6b3d94b2470fd38623876b5/zonabokobukox.pdfIn PDF document text
- http://aaas.handyfriendship.com/upload/files/goxobamuxitevoraxegon.pdfIn PDF document text
- http://saipanbooking.com/FileData/ckfinder/files/20210913_A52E8BC62BDCEDAF.pdfIn PDF document text
- https://mobiligennari.com/userfiles/file/nonusitobilitama.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_off0000d2db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000eaf2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAF2	10952 bytes
SHA-256: `44f513b8b159accf8740c0c1ef7793ba2eddad05aed99d293b1cd04f3980a6a2`
`font_02_sfnt_off00010468.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10468	17640 bytes
SHA-256: `7d3dafcb0c7167eb3d944cf5237cb637c640cf5c1d78585c11253ed2c0e21754`

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