PDF malware analysis — malicious · 4b19aa346e61c01f

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 03:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d7ef6cafa3c708978d5094c97a30c3b3 SHA-1: 324183aadce6d0f5ebee36a1f10a5f91f5ef1f2c SHA-256: 4b19aa346e61c01f2712f5e1bd955119145fb8d99f409f5c8adb3b1a6a60ccba

176 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. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and other potentially malicious URLs. The document body is truncated and unreadable, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://haisanquangninh.org/data/dulieu/files/93374768082.pdf In PDF document text
- http://geometracosentino.com/userfiles/files/nemuzega.pdfIn PDF document text
- https://copperscraphandlers.com/ckfinder/userfiles/files/48447657647.pdfIn PDF document text
- http://ciaooo.ru/uploades/userfiles/file/kikamewuletazuziwekivixus.pdfIn PDF document text
- https://mariapolis.net/ckfinder/userfiles/files/sigorunojafadinok.pdfIn PDF document text
- http://asr-net.ru/uploads/files/bovamiretemedason.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/bozilivafobizaninas.pdfIn PDF document text
- https://itexpertdog.com/upload/files/mevedoleluxu.pdfIn PDF document text
- https://lanna-flyingclub.com/ckfinder/userfiles/files/25657363501.pdfIn PDF document text
- https://apz-arte.com/ckfinder/userfiles/files/26395060034.pdfIn PDF document text
- http://1night2daytour.com/ckupload/files/xozopadisaxevi.pdfIn PDF document text
- http://syntra.pl/userfiles/file/gugaxe.pdfIn PDF document text
- https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a93eb1091---gijufinulavovew.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef0c90acd---77447581829.pdfIn PDF document text
- https://citronel.com/userfiles/files/lowitolirilobote.pdfIn PDF document text
- https://crbz.ru/userfiles/file/fusakupotisagokefowetes.pdfIn PDF document text
- http://maudchristan.nl/ckfinder/userfiles/files/26184758606.pdfIn PDF document text
- http://fuyu.010bi.com/ckfinder/userfiles/files/55147432369.pdfIn PDF document text
- http://ourdesign.hk/ckfinder/userfiles/files/356426015.pdfIn PDF document text
- http://neoneophytou.com/ckfinder/userfiles/files/4794686224.pdfIn PDF document text
- https://istanajp.net/contents/files/rixopimuxanefiwewudi.pdfIn PDF document text
- https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161358832e3894---68563901827.pdfIn PDF document text
- http://tuanayapim.com/rsm/files/tagadunofudisugowed.pdfIn PDF document text
- https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c599479a680d80e0c972cec02a02c989/3549662356.pdfIn PDF document text
- http://architettodrabeni.it/userfiles/files/84482937817.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=qr+code+on+android+cameraPDF 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_off0000dc4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDC4A	10280 bytes
SHA-256: `f08f9f0e449ab56ecd46d0f95a3852f4ef87e8853507fd08d3aa053337a8d5de`
`font_01_sfnt_off0000f367.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF367	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010b79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B79	17796 bytes
SHA-256: `a7d844683a5d25780a70fe9427a239388d07ff847bdf816979748bef1bc41521`

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