PDF malware analysis — malicious · 2b4a92610aa8f5b9

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 11:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 943862e1fc225c2c5490ca593b66b531 SHA-1: 846d0b5c3f4a3a934fecb094bc99df9d79ee9cf0 SHA-256: 2b4a92610aa8f5b97b61bf359af37537b68e3b2f06e2b7e039f084f154df6cc6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=vedic+mathematics+book+pdf+free+download PDF link annotation
- http://hwayinn.com/image/files/20210816_181450.pdfIn PDF document text
- https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/22ctbpd9b1adqfj5ofu5l8ra81/mugemokas.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822b18df40---kubozutawexejirebikum.pdfIn PDF document text
- http://x-site.by/upload/editor/files/90144967529.pdfIn PDF document text
- https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/0351ac3fa0b95325f1460d918b9700a2/59467333759.pdfIn PDF document text
- http://cesnek-vysocina.cz/UserFiles/File/junot.pdfIn PDF document text
- http://exdebt.bg/userfiles/file/pejesibajapilok.pdfIn PDF document text
- http://holidayservicemarsala.it/userfiles/files/60138713647.pdfIn PDF document text
- https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/tadejutujime.pdfIn PDF document text
- http://derma-dts.de/files/file/vagojuri.pdfIn PDF document text
- https://dursunguney.com/userfiles/files/bezofujetarakob.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/foxobamosijegonufaritu.pdfIn PDF document text
- https://cubic.is/userfiles/file/nidokumaxetuwam.pdfIn PDF document text
- http://transfertrolley.cn/d/files/73252829349.pdfIn PDF document text
- https://elpollopaulino.com/cenavarra_userfiles/files/sominutiwakopukegonowe.pdfIn PDF document text
- https://bor-diing.com/upload/files/lorojuruzinojerijajupu.pdfIn PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/nuvuxitogubitazikami.pdfIn PDF document text
- http://bpabv.nl/uploadfiles/file/99097190463.pdfIn PDF document text
- http://sbox-technology.com/upload/datoteke/67771918385.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718928cd8f8---xudivalipefajomipatanegem.pdfIn PDF document text
- http://canxetaianhduc.com/images/file/53758709737.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/lunezusawimivamawewiw.pdfIn PDF document text
- http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607912e44cf88---pomobu.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3958ddd43f8aeece944b8d9bad1633ed/90914904133.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_off0000e059.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE059	11172 bytes
SHA-256: `415d1f0b4df091e26515a41c4e35975a8350a8d2ac739ce681baeceff900d832`
`font_01_sfnt_off0000fa18.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA18	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001122a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1122A	19128 bytes
SHA-256: `42ccf8029b255c9c483136735834caf5ebe7f7c82add9d97b2bb429649b4385f`

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