PDF malware analysis — malicious · 0a43bca714c4a37b

MALICIOUS

PDF

68.7 KB Created: 2021-10-10 05:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: ab05dad553ed1fdf5994a5fadf3a2e48 SHA-1: 74d7721840a3ee19403e4cccd251f22c1d2c7c63 SHA-256: 0a43bca714c4a37b24693102e732cfbc68d1893e36b7f395ccf2f1a3e9db88f9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

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 http://kleinschaden-expert.de/userfiles/file/bugaziwoxizakiro.pdf In PDF document text
- https://confeccionesruiz.cl/UserFiles/File/jimodanamugolugegab.pdfIn PDF document text
- http://bibikid.ru/upload/49887732866.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7bbdb300a43c83afbdfafc15946c98c3/77411136206.pdfIn PDF document text
- http://boxethai38.com/upload/file/kopigezutobonenaf.pdfIn PDF document text
- https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4841d9b049976030d22fb9c549bfae81/36982000719.pdfIn PDF document text
- http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/nunulituxipudopakuw.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161607decd9d17---xukonitubato.pdfIn PDF document text
- http://alfadent-volg.ru/images_uploads/files/zizudopijasakaruli.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04dd393d100a8300adc36726a5ee8273/18270606327.pdfIn PDF document text
- http://myslizdrave.com/soubory/23156076776.pdfIn PDF document text
- http://tatagz.com/uploadfile/files/25027623809.pdfIn PDF document text
- http://corse.annuaire-regional.com/ckfinder/userfiles/files/muvinoz.pdfIn PDF document text
- http://singer-island-condos.com/userfiles/files/80853197367.pdfIn PDF document text
- http://k3projekt.pl/uploads/userfiles/files/rajezigivi.pdfIn PDF document text
- http://ydtmuhendislik.com/ckfinder/userfiles/files/95353885446.pdfIn PDF document text
- http://zimmerei-possert.at/jujonixovenesimot.pdfIn PDF document text
- http://yishiweb.com/upfiles/files/20211004_155603.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=an+example+of+operating+system+softwarePDF 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_off0000ad0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAD0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c521.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC521	10984 bytes
SHA-256: `860fddc07ce6448e5a4949a6a7adfe46ede78cb70e527b8bd7acc84ee6db0f4f`
`font_02_sfnt_off0000deb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDEB4	15380 bytes
SHA-256: `88dcf9fec7691f1eb9464252235fffe62befeeba42374836756123d41883c80f`

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