PDF malware analysis — malicious · 51a3ea106fa25103

MALICIOUS

PDF

84.2 KB Created: 2021-07-02 03:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: f71f386b396417a92a61e39dfe680d2b SHA-1: 2499d321006da92003dc75e952767adff302ef04 SHA-256: 51a3ea106fa25103ddddda7573b4aa7ecc49edfb1bf346b97f06a670cce008b8

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links indicate a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9922

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://garglob.ru/uplcv?utm_term=meaning+of+lustfulness PDF link annotation
- http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160813a4b3b449---dimarezut.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/dk16s4kv66m5e8ivat51gut9m2/6971742381.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rf7pe11vcnm6kf55p9eglvo332/dogufipuroguxigijemal.pdfIn PDF document text
- https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/c003f4daa33b6c5bb3c6adf11e80734c/buburesiroba.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f90vspuh1j63vgfrctu8vbg91/xedixo.pdfIn PDF document text
- http://lungshingcentre.com/userfiles/31267893153.pdfIn PDF document text
- https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/p2m8la33rt4ts60o9pcb2ek4dr/walovibemetagulijil.pdfIn PDF document text
- http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/dcfe1ef5a0f265663b876dc86772263f/zupigubafupunogukemo.pdfIn PDF document text
- https://triosms.com/userfiles/file/44620747385.pdfIn PDF document text
- http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c88e5fdb7---zonenopexaxenujanoziwe.pdfIn PDF document text
- http://pusancard.com/userData/board/file/tixowaraketekixukewa.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6b8c8622acdf9b53ddbde4107dea0eb3/buziraninuweromuleto.pdfIn PDF document text
- http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269a412386---4255901279.pdfIn PDF document text
- http://mn-print.ru/ckfinder/userfiles/files/dujup.pdfIn PDF document text
- http://www.hon-ro.hu/userfiles/files/50622096624.pdfIn PDF document text
- http://humanitool.ru/userfiles/file/3454917981.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a515ba5e---rejobexuvefumafo.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160797a9fcfba7---14259418512.pdfIn PDF document text
- https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a963b1ebd35---89314216411.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8fe796b3269dfbfe6dcd807b498df47c/pitofitizoga.pdfIn PDF document text
- https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc1754e39---gezisi.pdfIn PDF document text
- http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074c8b082422---xesej.pdfIn PDF document text
- https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/bfc79007a2cf7323d6f1937b8caa4620/renokinow.pdfIn PDF document text
- https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/6fda9f05372116f3bb9d93a8d10b66a6/pisadafumumujipuwone.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_off0000c33f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC33F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000db56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB56	10384 bytes
SHA-256: `17cebd97473dc98612dd3aa45079666cbc3b11e186ce3a5d53f2ed6616558874`
`font_02_sfnt_off0000f2f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF2F4	19868 bytes
SHA-256: `9fb7bb267ac546d2e0e75e36a59c94b4f888d25992cd5f966e837a328bb7b4e8`
`font_03_sfnt_off00011355.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11355	19340 bytes
SHA-256: `024f3d86b2e6ce1e9df4af9bf8104975d1d5218c1f6d48bd2ee1105409442547`

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