PDF malware analysis — malicious · 65a6b0cf7cd2972c

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: e50d8e7487ce12fce81bc826addfba57 SHA-1: 3eeee99936029a7a48b076ff7e6fa1e4355e5060 SHA-256: 65a6b0cf7cd2972c2cd2322378eb0e9af4fcd8425fe7a49fc2aad672a1c1b21f

156 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. Heuristics indicate it functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. The embedded URLs and the nature of the heuristics suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/254d41c1cc51dde608f3872889293472/40994878477.pdf In PDF document text
- http://an-ocn.ru/ckfinder/userfiles/files/sodaganes.pdfIn PDF document text
- https://ecoretras.com/file/1260681995.pdfIn PDF document text
- https://cafesca.org/ckfinder/userfiles/files/84181725056.pdfIn PDF document text
- https://associazionedynamica.it/uploads/file/beverimufuvo.pdfIn PDF document text
- https://haps.company/wp-content/plugins/super-forms/uploads/php/files/rd3kea5ga5a3joec3ja7rmbuq6/gijej.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f0aca242d8---jalodukagulatud.pdfIn PDF document text
- http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56c894d04---57561762538.pdfIn PDF document text
- http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa20793514---83327734971.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/toci1ne2j2palp59n9phki6d9j/rojew.pdfIn PDF document text
- http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608110a6832f9---13907434141.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1f7951399994e2214572158f931ec92c/96025963734.pdfIn PDF document text
- http://at2apigroup3.com/contents//files/63254404649.pdfIn PDF document text
- https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/508b7740d452555b4a4357292f551ed6/87235592829.pdfIn PDF document text
- https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/466668bf0e52c51ef741437ea0858e11/tanarozo.pdfIn PDF document text
- https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc10ecbef---45135452693.pdfIn PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4c3f02013---nujopuwide.pdfIn PDF document text
- http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b10a628f0---tosejelitarukakumu.pdfIn PDF document text
- http://bundoreh.com/fckeditor/files/file/bilabugulovivared.pdfIn PDF document text
- https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e9b2e12ac30a0922a72c79ce71963be6/menanatakepapipe.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9275f108a0---puxuvoxuzaju.pdfIn PDF document text
- http://malagi.pl/user-files/fck/file/folejizike.pdfIn PDF document text
- https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa2309372---60580702373.pdfIn PDF document text
- http://xn----8sbosgn1al9i.xn--p1ai/ckfinder/userfiles/files/liromelipopoxaj.pdfIn PDF document text
- https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n2gi4sj232ppi51hpiu8rj7ln4/48982616919.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=evaluation+les+compl%C3%A9ments+circonstanciels+cm1PDF 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_off0000e1e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1E4	19596 bytes
SHA-256: `f4b75d8ef0d00cc4e2c5680abe04b606247ed45227aa2c7b0c558bea46be36be`
`font_01_sfnt_off0001132c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1132C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012b43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B43	10888 bytes
SHA-256: `1f9547bf95ef84a0d53f1b907413bfdf91f0bcce6e62cb160ef71916dced02c9`

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