PDF malware analysis — malicious · 88630048dbd00a14

MALICIOUS

PDF

85.9 KB Created: 2021-08-25 01:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 066c0b2c51b87f879bef0f088359f498 SHA-1: 068b1e408bb6043d4586ab06c366275aa4d1eed3 SHA-256: 88630048dbd00a14ebfe9218209cba455015c1123d8f0113a7983e1a2c5aa08d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

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=small+friendship+quotes PDF link annotation
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610befc0b01f4---zuvawividuzo.pdfIn PDF document text
- https://0286869143.com/editor_images/files/wuzakufivoti.pdfIn PDF document text
- http://inwama4.vn/webroot/img/files/xadomubez.pdfIn PDF document text
- https://bankubezpieczen.pl/userfiles/file/79755110623.pdfIn PDF document text
- http://straps.by/ckfinder/userfiles/files/zitugasimaminafez.pdfIn PDF document text
- http://globalsublimation.net/uploadfile/files/marutak.pdfIn PDF document text
- http://timebank.ru/sites/default/files/photos/pagefile/51660134871.pdfIn PDF document text
- http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded4af8ae---mizeroxuboxivotoropoxuxi.pdfIn PDF document text
- http://ct-tci.com/cttax/userfiles/files/43735416015.pdfIn PDF document text
- http://rdmsrl.it/userfiles/files/sixil.pdfIn PDF document text
- https://amatnieks.lv/pictures/image/poradugupemigutul.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119a335c51c1---7167322540.pdfIn PDF document text
- https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84f0a72528---41848941561.pdfIn PDF document text
- http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef0d67103---2826043195.pdfIn PDF document text
- https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04feb18e3---29798123464.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/68198107777.pdfIn PDF document text
- http://rungruangsteel.com/public/upload/userfiles/files/24531723560.pdfIn PDF document text
- http://cpils.com/userfiles/file/momatisanuziti.pdfIn PDF document text
- https://banghenails.com/upload/file/sibixemiwikevizu.pdfIn PDF document text
- https://genericdiabeticteststrips.com/userfiles/files/72603432271.pdfIn PDF document text
- https://85097781.com/upload/files/sawekuvig.pdfIn PDF document text
- http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7edade88ac---48898394356.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f485024679---13839166834.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_off0000ec49.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC49	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10460	11084 bytes
SHA-256: `9a970f45e56da1f944ecbd122ec3c4096bc79c7dbda56752d449c751f9ac3ae9`
`font_02_sfnt_off00011daf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11DAF	16632 bytes
SHA-256: `ec8485322ec319fea0b67edf7c8f39dea38176df9725402833745e18bbe0bf67`

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