PDF malware analysis — malicious · 41527575aa32cd05

MALICIOUS

PDF

92.9 KB Created: 2021-07-14 09:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 7581186b9ecef65338a1fcac0b7fd7a6 SHA-1: 6afa887e66bfabc1114c45956dedc10559022ac1 SHA-256: 41527575aa32cd053ed82fa2f9be2a13719e91a3966811782e8e9093d78c748b

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of `utm_term` parameters suggests a phishing or SEO manipulation tactic to lure users to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://crysiq.ru/uplcv?utm_term=subway+surfers+for+pc+setup PDF link annotation
- http://muszempilla.com/files/file/99838213635.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071be9b7dd6c---mejefumonixuxolejorawo.pdfIn PDF document text
- http://smn68.com/clients/75339/File/30828672733.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00226dc39---lenuzozeniforeruda.pdfIn PDF document text
- http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8fa959b7---85291534532.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b22a345e---71845188700.pdfIn PDF document text
- http://big-blue-bus.com/pics/fotos/1/file/rebuditafesenedevebawa.pdfIn PDF document text
- http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/85035236881.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f0b1d330---47270531081.pdfIn PDF document text
- http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e5729e1ff---15091282769.pdfIn PDF document text
- https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/445643517945824103fc20d3b46a3f31/vonalozudowifu.pdfIn PDF document text
- http://daltan.hu/userfiles/file/19002349324.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/68fbbe475e9a3dc57a2b87770d7a45ad/11007444074.pdfIn PDF document text
- https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/796baf968e1befddfe027cc61a30d656/37703851206.pdfIn PDF document text
- https://alihuata.com/userfiles/file/rewavubatafufos.pdfIn PDF document text
- https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4a4268b768682860ab47abcdd02abe55/34094021934.pdfIn PDF document text
- http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5d091a61---78626630343.pdfIn PDF document text
- https://shopexpert.com/app/webroot/files/userfiles/files/vapetiv.pdfIn PDF document text
- https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/d769b51a61ddc6665536803dbbe3ded9/93318598722.pdfIn PDF document text
- https://abofahed.com/userfiles/file/xamipodusevijivafufe.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbde665f8---79044217982.pdfIn PDF document text
- https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c93e47589ee---nazovesolu.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d438a26fde---38489898816.pdfIn PDF document text
- http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e4541b5f---vipawoxezawubas.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb10b121a---zanonuxemozijil.pdfIn PDF document text
- http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de4c7a16dfa---56576518273.pdfIn PDF document text
- http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a64ca397---musidizibizofapebukidubo.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001075f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1075F	17288 bytes
SHA-256: `bed9a60c90f3ab517c81b08f5572b15b5fbbdda142e83ade86210a1a4dfe0595`
`font_02_sfnt_off000134d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x134D0	16744 bytes
SHA-256: `b48b479eb3f91898c0159c3630858bb2b7fcfcbc31c08b3194647487cece156a`
`font_03_sfnt_off00014c6a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14C6A	10748 bytes
SHA-256: `a820fa80015786366b2a81cc70a24149f8be80a0f26ce0ae27ab3ead9eb10ad8`

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