PDF malware analysis — malicious · ca91503fdf54a3d0

MALICIOUS

PDF

88.4 KB Created: 2021-09-02 05:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 9474e0ce8279f1ace5536f5742eb14c0 SHA-1: be08dc71a25f89674b0d05fdb1060bd7e20271a8 SHA-256: ca91503fdf54a3d0cc3dfdada6d3d15c0ff1b78ab91b7edc107858c80910dbe6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to lead users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common technique for distributing malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

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 http://thevisionkharj.com/userfiles/files/kiwifelajizawebesisi.pdf In PDF document text
- http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18699717a---xowajemutad.pdfIn PDF document text
- http://ristoranteyuri2.com/userfiles/file/61815932982.pdfIn PDF document text
- https://hondaotohaiphong.vn/upload/files/nusilagojes.pdfIn PDF document text
- https://ascinfratech.com/clientprojects/trading/file/litoji.pdfIn PDF document text
- http://topcudental.com/img/userfiles/files/wojovitoxinuxigepik.pdfIn PDF document text
- http://achilleferolla.it/userfiles/files/70222922822.pdfIn PDF document text
- http://prinsart.ro/uploads/files/milodiradoj.pdfIn PDF document text
- http://haenuri.net/ckupload/files/48831967176.pdfIn PDF document text
- http://jjmcp.jp/userfiles/Image/file/70443195222.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c860ac1a4a4---11957526038.pdfIn PDF document text
- http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3681be652---99903607524.pdfIn PDF document text
- https://anthonygillant.com/userfiles/file/nodekojisuf.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5238b7d68---62608827372.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1621228052.pdfIn PDF document text
- https://sportuna.be/ckfinder/userfiles/files/57911173779.pdfIn PDF document text
- https://archielectronics.com/userfiles/files/48440702839.pdfIn PDF document text
- http://contextuae.com/resimler/files/4830329096.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611df7520a955---80809700739.pdfIn PDF document text
- https://webaprint.be/img/file/zuwupexaguxuziguzeniw.pdfIn PDF document text
- http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607963c5cb3f6---84149189030.pdfIn PDF document text
- https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/nfj0st4dcldc31c2sfsqcrplv6/48358227865.pdfIn PDF document text
- http://greatnice.club/updatefiles/file/98550582385.pdfIn PDF document text
- https://broodjedenbosch.nl/ckfinder/userfiles/files/xibafabuxe.pdfIn PDF document text
- http://lncxjzxxw.com/upload_fck/file/2021-8-12/20210812172705582942.pdfIn PDF document text
- http://fmmvn.net/userfiles/files/2657542046.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=100+sentences+of+simple+present+tense+in+englishPDF 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_off0000f368.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF368	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010b7a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B7A	17852 bytes
SHA-256: `37fce71d7adea442ec41eac7206484bca0e99d20982b27223bc453efb9fedc90`
`font_02_sfnt_off00013956.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13956	10844 bytes
SHA-256: `d3f918e49689748f04e25eaf4945bcf95e6bf313844320160fd1bae3f60560a1`

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