PDF malware analysis — malicious · b7baca9815d5e221

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 1e0b78e0c79e79e4ca8502492860cae7 SHA-1: ff5057f05288ca0ff166eb62070532594c2c2791 SHA-256: b7baca9815d5e221c2986840fd127b9055c341620e19504c57f53471a3760620

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://ywint.com/ckfinder/userfiles/files/1632169572.pdf In PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142369595036---didomumuxol.pdfIn PDF document text
- https://swift-tw.com/lcc/upload/files/karumebiwotemigovirawan.pdfIn PDF document text
- http://marinaxaraes.com.br/ckfinder/userfiles/files/kipitozegetoburogop.pdfIn PDF document text
- http://bancasemecanino.com/userfiles/files/nojepokupejiwoxofazalevoz.pdfIn PDF document text
- http://alexdisinfestazioni.com/userfiles/files/20548323020.pdfIn PDF document text
- https://bokaichenyu.com/upload/files/27917404579.pdfIn PDF document text
- http://csc0532.com/userfiles/file/20210920171401_5n9fto.pdfIn PDF document text
- https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/86797682287.pdfIn PDF document text
- http://maivietnamesecotati.com/uploads/files/91508655930.pdfIn PDF document text
- https://newsale.linyn.mobi/upload/ckeditor/pages/files/60363760581.pdfIn PDF document text
- https://mancomunidadvaldizarbe.com/userfiles/files/40252705831.pdfIn PDF document text
- https://thinkglobalcompliance.com/ckfinder/userfiles/files/1827865239.pdfIn PDF document text
- https://congchung7.vn/upload/file/83316250900.pdfIn PDF document text
- http://www.andreapondika.cz/file/76403898799.pdfIn PDF document text
- http://iviltra.lt/images/files/ninofadozadalazasim.pdfIn PDF document text
- http://domosplast.hu/files/file/19687611730.pdfIn PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/65485396149.pdfIn PDF document text
- http://aa-nusd.jp/tolaw.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/ruwekeletowokimipeba.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139972ea38c4---34674963817.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98fe852d0---21541250756.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493c0253660---74883634080.pdfIn PDF document text
- https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26dd06722a42296de422becc0eb99f28/pepudosixojaxawulovugor.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=free+fire+advance+server+apk+downloadPDF 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_off0000d369.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD369	10736 bytes
SHA-256: `4174ae3c48c32b0735739354943b02ea5f45bd2855957d3676c5a0499e81c8e2`
`font_01_sfnt_off0000ec30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC30	16284 bytes
SHA-256: `5f646f612060255a3db04c3d8d56ea201a8b9d4188a6ce137e2957c255bbf6c4`
`font_02_sfnt_off00011662.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11662	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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