PDF malware analysis — malicious · e2763ccff93a5a01

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 23:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 8ec3cbd33158cfcbd9073f78c4128035 SHA-1: bc9557488e437ae620b11802a7fdfda6ad1a8e61 SHA-256: e2763ccff93a5a01cd4d58b248b794748edbb2bdd56f293967719b3e48e6ddd2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or link-farming operation. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=livro+violetas+na+janela+pdf+download PDF link annotation
- http://stauarchitetti.eu/userfiles/files/kotuvukirovepiwuminebak.pdfIn PDF document text
- http://blpest.com/UserFiles/file/61916196805.pdfIn PDF document text
- https://alusol-kw.com/ckfinder/userfiles/files/27842960520.pdfIn PDF document text
- http://gdwtechnology.com/fckeditor/file/35792702264.pdfIn PDF document text
- https://gabconstruction.com/ckfinder/userfiles/files/81420381310.pdfIn PDF document text
- http://aardbeienfeesten.nl/uploadimages/files/funoburo.pdfIn PDF document text
- https://tdfstore.it/file/47667441385.pdfIn PDF document text
- http://autofulltravel.com/userfiles/files/ziminigerufurasikano.pdfIn PDF document text
- https://karinbentum.nl/uploads/file/26751379231.pdfIn PDF document text
- http://akkoryazilim.com/userfiles/file/kasipisulafipelixudubefo.pdfIn PDF document text
- http://aroma-es.site/yamituki-n/uploads/files/vinadotakonutezewasudelu.pdfIn PDF document text
- http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16083e46329ffb---74284235107.pdfIn PDF document text
- https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/nakhiv6gq2kvdlj6umrrt79lcc/18708213997.pdfIn PDF document text
- http://namngonviet.vn/user-/files/kijopam.pdfIn PDF document text
- http://pujcovnanaradi-tvarozna.cz/userfiles/files/vedifaxopisamir.pdfIn PDF document text
- http://webinaris.blog/ckfinder/userfiles/publics/files/74260349881.pdfIn PDF document text
- http://www.dr.schure.net/ckfinder/userfiles/files/zekumuvilegikeduluzevej.pdfIn PDF document text
- http://indagosrl.it/userfiles/files/luxadusowip.pdfIn PDF document text
- http://magicdiscoradio.hu/userfiles/file/25112677259.pdfIn PDF document text
- https://musikkursus.dk/userfiles/file/65380258242.pdfIn PDF document text
- https://jeneifogaszat.hu/cikkdata/files/jomupijaf.pdfIn PDF document text
- http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/60560391649.pdfIn PDF document text
- https://salvamontbihor.ro/app/webroot/files/userfiles/files/vizenaxoz.pdfIn PDF document text
- https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad580adb2---55169988642.pdfIn PDF document text
- https://patc.fr/imagesfile/43461315126.pdfIn PDF document text
- https://travelsafeway.com/userfiles/file/69201709752.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_off0000cc62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC62	18496 bytes
SHA-256: `2db24e1dc307d1b8df13a3cfb603eec92348003ae7a2204a77cdea5ee83a720e`
`font_01_sfnt_off0000fbb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB3	10732 bytes
SHA-256: `649e48a5301e430af817708fa0a07f614fbbb8e5f1aa208eb4f4813f6e6b6c71`
`font_02_sfnt_off0001147f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1147F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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