PDF malware analysis — malicious · c0cc87ac65b1b94a

MALICIOUS

PDF

102.3 KB Created: 2021-07-26 08:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22

MD5: 5a7e077e458eb5137b4968d2f2b6c503 SHA-1: eb4daf75382fb816d4631fe645dd157c1e68124f SHA-256: c0cc87ac65b1b94ab8a74bb5da24457add11650bd43c14702f8f13af3e2832d4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external PDFs hosted on compromised or disposable domains, suggesting a link farm designed to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9902

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://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/5lkgchetvhtmh0cc8taiv2s9f9/7088503300.pdf In PDF document text
- http://aktifithalat.com/resimlerfiles/wiminazisarosivuvizididos.pdfIn PDF document text
- https://jbdclothiers.net/emailer/userfiles/file/rixawupazeb.pdfIn PDF document text
- http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a132381303---13810427473.pdfIn PDF document text
- https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/58574cb3ee737745b1372f63880ef8d8/25258490133.pdfIn PDF document text
- https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c741f6b2---rakif.pdfIn PDF document text
- https://jaukiaplinka.lt/ckfinder/userfiles/files/64359631873.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b469f713556---joluzupenodenowuturuji.pdfIn PDF document text
- http://minhvuongthuphap.com/upload/ck/files/xasexisu.pdfIn PDF document text
- http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb394ddabe---79835876461.pdfIn PDF document text
- http://chistogood.ru/admin/ckfinder/userfiles/files/guwasuroloketevor.pdfIn PDF document text
- http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a10cef89---97495845099.pdfIn PDF document text
- https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/6156ca9c8dd830089f10d5dc4de591b3/situku.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4953c02281---2794424121.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/cquu2irb5tnmilmkg5vierqp7u/besinerin.pdfIn PDF document text
- http://ttc-investco.com/img/files/juboxajaxojazep.pdfIn PDF document text
- https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984820d8a53.pdfIn PDF document text
- http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a6372a611---95704440671.pdfIn PDF document text
- http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8r1hjln7q7225quikmluplf85k/gamowoboxap.pdfIn PDF document text
- http://cec-intl.ru/app/webroot/files/file/9795881558.pdfIn PDF document text
- https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/99n0b5vghhee3949anouggvhro/naravederupusefivoba.pdfIn PDF document text
- http://wib24-admin.de/uploads/file/9159162102.pdfIn PDF document text
- https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lrh4pntm1kkb03t35gkf3vu0ts/36062058115.pdfIn PDF document text
- http://murielbellhomes.com/userfiles/files/19969435155.pdfIn PDF document text
- http://bielwod.com/userfiles/file/43678454991.pdfIn PDF document text
- https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb057bbf85---menuz.pdfIn PDF document text
- https://aviseco.ro/userfiles/file/99005456622.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kgoakq2bqslmdon74gjtbln38h/44912496523.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=t%C3%BCrk+gida+kodeksi+mikrobiyolojik+kriterler+tebli%C4%9Finde+de%C4%9Fi%C5%9Fiklik+yapilmasi+hakkinda+tebli%C4%9FPDF 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_off00012070.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12070	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00013887.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13887	11948 bytes
SHA-256: `5d85e6245c5fcb2d5614560b26795a920ce2e4f9070087b61c185db56c9dc7f8`
`font_02_sfnt_off00015395.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15395	20560 bytes
SHA-256: `440aa2a47e724cadccdc06cb30cfcff5fd2864549f5a81489b634f77416aec9e`

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