PDF malware analysis — malicious · 165bf4deaf2817bb

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 22:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 7fb4d81c7aad5fb8abaac8c18047d4e2 SHA-1: 542b747baf2547ee8c66840d010feab661ea1a10 SHA-256: 165bf4deaf2817bbecdc256dc288e7c6aa045c874c31c26d3d57bccb4fb34411

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO poisoning motive.

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://hediyelikhanem.com/calisma2/files/uploads/jefosusifeluteraxulibup.pdf In PDF document text
- https://mimpishio1bet.net/contents/files/tedufim.pdfIn PDF document text
- http://staractivecollection.com/resimler/site/files/73349064613.pdfIn PDF document text
- https://fotobolfestmeny.hu/mvc/userfiles/file/84060876448.pdfIn PDF document text
- http://rooptex.com/uploads/96227179607.pdfIn PDF document text
- http://jobsandhi.com/uploaded_files/userfiles/files/fexewimujuviti.pdfIn PDF document text
- https://www.ccs-corporation.com/ckfinder/userfiles/files/wulomobax.pdfIn PDF document text
- http://alwaysshine.com/fileimage/file/9246337303.pdfIn PDF document text
- http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e41162886a---dovujerazuvotu.pdfIn PDF document text
- http://dailycan.com/userfiles/files/nowenomelaxolefujesu.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d12b3660b---35505195956.pdfIn PDF document text
- http://tandartsindex.nl/images/uploads/79051833413.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/87013570904.pdfIn PDF document text
- http://satisfytech.com/ck/upload/files/janirupipe.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/831b57e4d92816855977391deb651d06/xewomiwasegojodepijasu.pdfIn PDF document text
- http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/86021592588.pdfIn PDF document text
- https://magicdiscoradio.com/userfiles/file/44132594258.pdfIn PDF document text
- http://poliambulatorioargentina.eu/userfiles/files/7799002991.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=firestick+hotspot+connected+with+problemsPDF link annotation
- 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_off0000aa4c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAA4C	16364 bytes
SHA-256: `549b14e8393ac3c2e380f3e747d53f54d3f9a0eed8318a497a3d97519d6add0e`
`font_01_sfnt_off0000d390.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD390	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000eba7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBA7	10912 bytes
SHA-256: `291c0e44e1d8e2f959d1c1ff9582150fb3344390b10e63f10e7acd3ddf046107`

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