PDF malware analysis — malicious · f5228b0e63fec11a

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 05:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c34e6d13f962d18d3e1a3bdedb8ab266 SHA-1: 6a0a26aaee1a88e08079f8f9189838ccdbc1002c SHA-256: f5228b0e63fec11aa6aa96521cad00e61f2eecc511497f673561265d56ab252d

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure indicate an attempt to lure users to malicious external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=definicion+de+evaluacion+del+aprendizaje+pdf PDF link annotation
- https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ea40a969cd14289a36cf00985d067e9b/65214646475.pdfIn PDF document text
- https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c48ebde4b---57219230086.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cd1c39cf---ripapowoj.pdfIn PDF document text
- http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea3272586---dimovaniveri.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c74d73e64c9---34474804375.pdfIn PDF document text
- https://jasz-pap.hu/UserFiles/file/85772544324.pdfIn PDF document text
- http://eperon-kochersberg.com/img_db/46711290128.pdfIn PDF document text
- https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/691f3ac5532315d6a6735a548cd5a14a/97196738757.pdfIn PDF document text
- https://abugfreemind.com/userfiles/file/20022279258.pdfIn PDF document text
- http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/vivegatezunofifixanelife.pdfIn PDF document text
- http://dmscsmartlifeblog.com/userfiles/files/82385431492.pdfIn PDF document text
- http://sztarmedia.hu/_user/file/ronogadezuvivuzopeda.pdfIn PDF document text
- https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae546e6f773---54970936945.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b46ecbf5---fetezasegenavobap.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9f34f77fa7591d78251db1b5ca4117a8/14145916822.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ccd424686---87218343618.pdfIn PDF document text
- http://veraschwemmle.de/fckdata/file/wezenomagivuxuj.pdfIn PDF document text
- http://nollve.com/img/editor/image/file/koribi.pdfIn PDF document text
- http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cacb9a27---98960905883.pdfIn PDF document text
- http://labotinnghia.com/img/files/weromas.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116f245506ff---189375084.pdfIn PDF document text
- https://ivanda-commerce.hr/userfiles/file/8816103624.pdfIn PDF document text
- http://yoron.net/up/files/53996853271.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087681d98095---wopirelejojapomaxi.pdfIn PDF document text
- http://www.awakohchang.com/image/upload/File/epuwijerored.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_off0000e4f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4F0	18076 bytes
SHA-256: `d6116b1ca66aa4e6dc9d155b87e0d2ebb1208d4a6f89cb3ee08352c3f7205531`
`font_01_sfnt_off000112db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x112DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012af2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12AF2	10704 bytes
SHA-256: `ae9430f96ef7748236f8cdb817244c3c058473e24b91663d850b35b1b911b9f7`

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