PDF malware analysis — malicious · 8b29a935907dfd80

MALICIOUS

PDF

77.7 KB Created: 2021-08-20 06:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 0790850a1ffa3d371a725c5b5d619ed0 SHA-1: 6883fac911263336340ee1d3c25e377db0bfcf0e SHA-256: 8b29a935907dfd80181bbf39f6f2f4d7015bc804b87067f03e9803bfddc3f9e3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=welch+allyn+otoscope+instructions+for+use PDF link annotation
- http://urjabatteries.in/userfiles/file/16963592894.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5554d532e---barumipuda.pdfIn PDF document text
- http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd81f313a---70680783632.pdfIn PDF document text
- https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a18ff8baadfb3bc468868773d7420e36/rixovuvunugewibitaf.pdfIn PDF document text
- https://plasy.com/uploads/file/xokisikerasozagebaruterup.pdfIn PDF document text
- https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ssv4js2v0f3cmnfv5n8kvokr0v/zovewofotosezawamawinad.pdfIn PDF document text
- https://ochronaskory.pl/pliki_user/File/68042192148.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77ed6df762---82249054314.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed342bee0d---9273296480.pdfIn PDF document text
- https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840414ff24---tewid.pdfIn PDF document text
- http://www.ekoforte.com/upload/file/xenavala.pdfIn PDF document text
- http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6f11c3d3---99514141657.pdfIn PDF document text
- http://pastoret.it/userfiles/files/kogepovi.pdfIn PDF document text
- https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c4b6210747dc9a3d908ea99dc7c77e44/jimaxisipiguwuxu.pdfIn PDF document text
- http://doyen.cc/images/upload/File/35226477102.pdfIn PDF document text
- http://www.pranabkumar.com/fckimages/file/lemigagoburozefup.pdfIn PDF document text
- http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/30779295458.pdfIn PDF document text
- http://vinaaquachem.com/uploads/files/1649379498.pdfIn PDF document text
- http://gdgom.com/upload/file/210623095118933543jhs1snwut8jj.pdfIn PDF document text
- https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/0i2t4cvl9a7fvfm7t07ath5egt/22529569720.pdfIn PDF document text
- http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adccad26f69---89678152511.pdfIn PDF document text
- http://kubak-ubezpieczenia.pl/userfiles/file/27485014673.pdfIn PDF document text
- https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ea00de78a823ca3b2d50ca964db32edf/7901102128.pdfIn PDF document text
- http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91b0470ec---filubanonisemivogipoku.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/da0716228bd15ee244e1c38280e4a7fc/13015352624.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_off0000cde6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDE6	10784 bytes
SHA-256: `f4a4fb7036724447a1581321b393058854313e10e6f384a6123d819ca98ff43f`
`font_01_sfnt_off0000e6c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fed2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFED2	16024 bytes
SHA-256: `1dc43be26d3d76d7dde8eebb780031b24932a5f75090b4db51988b37b47b01ab`

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