PDF malware analysis — malicious · cb44b462a60e49e3

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 20:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 8bbff1c4bbe9c49f74e2ab3daed07011 SHA-1: 9e2970be1340e8499a260ea11c6fe42d735beb4c SHA-256: cb44b462a60e49e357f714180db1dc3284fafc38965a9c3ab797346e09bccc33

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://oniceh.ru/uplcv?utm_term=firmware+j2+prime+4+file PDF link annotation
- https://intervalhousehamilton.org/ckfinder/userfiles/files/58743680219.pdfIn PDF document text
- http://ketphatthinh.vn/upload/files/89315363489.pdfIn PDF document text
- https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c67ddaa0---78064372389.pdfIn PDF document text
- https://dutchfansitenetwork.nl/ckfinder/userfiles/files/gutuxosebe.pdfIn PDF document text
- http://gpmpoolandspa.com/ckfinder/userfiles/files/14569046078.pdfIn PDF document text
- https://bouveau-consulting.com/userfiles/file/65041389322.pdfIn PDF document text
- https://amgaa.org/temp/files/mijelibudepalezusut.pdfIn PDF document text
- http://maquinandoysubastando.com/dleyes/admin/fotos/file/9929737243.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161469d491fbf7---25269832163.pdfIn PDF document text
- https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d5qhpsjdbb8vc6f3osj27ai211/tanepazamexotelipat.pdfIn PDF document text
- http://newtarrytowndeli.com/uploads/files/mepewoketosudokazegagik.pdfIn PDF document text
- http://addisonplaza.abwingsmd.com/uploads/files/55994387465.pdfIn PDF document text
- http://aan.kz/ckfinder/userfiles/files/kagap.pdfIn PDF document text
- http://honghuibio.com/d/files/vadaxinekefupipitupipenap.pdfIn PDF document text
- https://z87992961.com/upload/files/20210906224827.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b53a25296f---24966194079.pdfIn PDF document text
- https://wemservice.com/ckfinder/userfiles/files/31485963538.pdfIn PDF document text
- http://korea-labels.com/ckfinder/userfiles/files/23353522.pdfIn PDF document text
- https://lederstuehle-shop.de/ckfinder/userfiles/files/68621620331.pdfIn PDF document text
- http://sunwisechem.com/Uploadfiles/files/xaloniwe.pdfIn PDF document text
- https://megalightgroup.lv/uploads/files/67573898737.pdfIn PDF document text
- http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94362025454.pdfIn PDF document text
- https://998.geektic.com/geektic/files/divudotemomuderuwojukune.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_off0000e060.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE060	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f872.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF872	18048 bytes
SHA-256: `e4f0ca3b4e2df6a8c1181dbc9ed91e4facfc49f21b6ae728c4ae51cbb8a6b742`
`font_02_sfnt_off000127fd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127FD	10420 bytes
SHA-256: `c819f3716657b219c7ee8a35b84b3a4bc66fdd3c063cea2f0e37ca5acc98a59c`

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