PDF malware analysis — malicious · dd58c0b48aaa0dfc

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 20:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 320e709f9142d1b54e0dd1dde575e791 SHA-1: b73b8ca7119514605a6617df87f8168bf4a50eff SHA-256: dd58c0b48aaa0dfc459590d75235f9147e56a0d38c7da3653d6b4529aeaee453

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The embedded URLs are likely used to redirect the user to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9913

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://krisoc.ru/uplcv?utm_term=hahnemann+biography+pdf PDF link annotation
- https://almoheetmanpower.com/public_html/userfiles/file/viforozugidanexi.pdfIn PDF document text
- http://www.fred-robin.com/ckfinder/userfiles/files/xabodiga.pdfIn PDF document text
- http://metall-press.ru/files/9643973191.pdfIn PDF document text
- https://stallion-international.com/userfiles/file/41450228471.pdfIn PDF document text
- http://poslovniimenik.net/firme_data/files/tabajibirutakos.pdfIn PDF document text
- https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/daa45ef4919ef5850d3004f83cda4f19/pesojogezepiwemazakida.pdfIn PDF document text
- https://fuoriscena.eu/file/5537021952.pdfIn PDF document text
- http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071b803417e5---tesimubenopi.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3e70127e---sibemini.pdfIn PDF document text
- http://heorungminhphat.com/luutru/files/wawivil.pdfIn PDF document text
- http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430172222599442.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0804cdfb49---gakixo.pdfIn PDF document text
- https://robert-zauer.cz/userfiles/file/81444652266.pdfIn PDF document text
- http://bonfiremadigan.com/uploads/fckeditor/file/zodetojunidafivoxufe.pdfIn PDF document text
- http://jew66.cn/fckimg/file/8579475350.pdfIn PDF document text
- http://snap-drone.com/userfiles/file/lefeririteranagajumen.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab1de44bf---95802669097.pdfIn PDF document text
- https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/f1mvt9fvms9hsqth149e78f6v2/vurusogiliremebakojoviluj.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/adf5cdc729cc801dde93390d21ca3294/zizuvop.pdfIn PDF document text
- https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/59662462435.pdfIn PDF document text
- https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88aa7209c3---topimesokedaxajazimumo.pdfIn PDF document text
- https://bepxuyenviet.com/upload/files/69967643789.pdfIn PDF document text
- http://hsound.ro/images/custom/file/takuli.pdfIn PDF document text
- http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/6729901904.pdfIn PDF document text
- https://langestrand.se/anvandarbilder/204/files/39369907644.pdfIn PDF document text
- https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1s1ci4ijeanqvd0qgr585558u8/61755269085.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_off0000fc35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC35	10876 bytes
SHA-256: `b73ba1d22fcc3242657ca935f6356a5d6650eec26edefc54667289536203721b`
`font_01_sfnt_off00011496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11496	19380 bytes
SHA-256: `b9ac804e5b551d51c7f2985d727855ff6bfd4ce7e63dd1e8546801a178708652`
`font_02_sfnt_off0001478f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1478F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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