PDF malware analysis — malicious · a2437968f5b94d34

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 17:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20

MD5: 234e60473e766273194b7e3fa2aa47fc SHA-1: e4c513d540fec834c7318f14c0c89a8fb2d20cc8 SHA-256: a2437968f5b94d34382987112dafd8416e1df8bd28c874eb56b72863e010f98e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious sites for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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=happiness+even+in+the+darkest+of+times PDF link annotation
- http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/mesckbd0dtssa1u9pjpto5h610/9087957986.pdfIn PDF document text
- http://train-in-japan.com/images/blog//file/21137032858.pdfIn PDF document text
- http://aucoindeshalles.fr/menu/file/sorafufelalukut.pdfIn PDF document text
- https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0ab5952e1a8c21514f16db4e8360dc90/87090684775.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/7887786489.pdfIn PDF document text
- https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c9bb8354d3a7b2842148d2a53fca5025/57271286418.pdfIn PDF document text
- https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/855ade6e2e73c6a7130e6d10486784d9/lemaseripobimokokap.pdfIn PDF document text
- https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/60ea2be7c3da5e36537c1a8f47fc6eba/18693338846.pdfIn PDF document text
- http://trendstyleimage.com/uploads/ckfinder/userfiles/files/31336768299.pdfIn PDF document text
- http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24484669026.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d30732af66---14891929030.pdfIn PDF document text
- https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9a5c3e7c53b431b66e579788811325e7/pejisuduresarisoweri.pdfIn PDF document text
- http://novussiteyonetimi.com/uploads/file/33099274335.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ivi3ps9kh8esbq4uuieoss8pn7/belakifivedunev.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_off0000d99f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD99F	24160 bytes
SHA-256: `ac19937023c4d474d1e934e129bbf68ec7e26295c0cac38b7f3eb8368d840a8e`
`font_01_sfnt_off00011503.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11503	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012d1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D1A	10868 bytes
SHA-256: `8d60ca8742d52d538e97872bacb85b26a43849e2875db6b4ea7c30867c128f0f`

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