PDF malware analysis — malicious · 2c4339064ee6083a

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 05:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 7e61bfd807a17cf2eb3bb6a3d898a854 SHA-1: 89a18d7eada47802e901d6909b9defe73aced32b SHA-256: 2c4339064ee6083a30607292e3a2531b94be79646b6a2efb2be64c4ca99e9d50

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The document's structure and heuristics indicate it's designed to trick users into clicking these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 81 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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://obchodsezlatem.cz/upload/files/1974460853.pdf In PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c77d3b9d28---85889134673.pdfIn PDF document text
- http://ebiocell.com/uploadfile/file///2021081714503334.pdfIn PDF document text
- http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/84d497a0d2f942522fedb1635104615e/95151011819.pdfIn PDF document text
- https://bawaniint.com/ckfinder/userfiles/files/66190822857.pdfIn PDF document text
- http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9739c8cd---28881247167.pdfIn PDF document text
- http://forepic.com/_UploadFile/Images/file/20773761226.pdfIn PDF document text
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f2ffda03adaaa53de81cb6e37fcf7cda/51097349671.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/347d92d2e5558078c4d2ab7140f3971a/86069261498.pdfIn PDF document text
- http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/363a02cc13c72dd74becc854959d9eaf/53341644228.pdfIn PDF document text
- http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8017b251---5955914216.pdfIn PDF document text
- https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/fujdlbkv48n6o9i5b6ivl2gla7/zapolara.pdfIn PDF document text
- http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9a5221cb---xuxorepoxe.pdfIn PDF document text
- https://tonymusic.se/UserFiles/files/fipobiwum.pdfIn PDF document text
- http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0954604187---lixesekegonibozowi.pdfIn PDF document text
- https://kingdomdatesuae.com/userfiles/files/41382797976.pdfIn PDF document text
- http://moestuinwebshop.nl/userfiles/file/timoku.pdfIn PDF document text
- https://olivierdaulte.com/ckfinder/userfiles/files/9176984901.pdfIn PDF document text
- http://toonesk.com/upload/viburoxosewetodetezif.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160806b905333d---63548663198.pdfIn PDF document text
- http://aclamerica.com/customers/CMS-IMAGES/file/zavofetupuxuvimowubir.pdfIn PDF document text
- http://rc-mst.com/mst/_upload/files/51654761377.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/1814248804.pdfIn PDF document text
- https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8a5c9827f---94181899752.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612de0e7205ce---56524535804.pdfIn PDF document text
- http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/etn9cmrhhhosl2throi9edpu8n/kibezemuw.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=log+and+antilog+table+pdf+filePDF 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_off0000e550.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE550	10500 bytes
SHA-256: `5b2982c532ea7f424cc9675994a4f0ec1e49b6a917bad3015b5562794076f341`
`font_01_sfnt_off0000fcd7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCD7	13696 bytes
SHA-256: `f7b7e3f99211aff1ce1cc56ae8c12a2c3035788a11ae82ca1254c15a56f4645f`
`font_02_sfnt_off00011ea8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11EA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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