PDF malware analysis — malicious · 3f53c4eecbaad77c

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 19:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 688ba5a72521bf3731aab025904ebdc6 SHA-1: e0b23489be448a074f08772b7f32306d4d101fb4 SHA-256: 3f53c4eecbaad77caad53d4774132cee79b389eba31aae51d0cd962b812da9de

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with multiple URLs pointing to disposable hosting. While no scripts were extracted, the presence of external URIs and the nature of the link farm suggest an attempt to lure users to malicious or phishing content, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d80a2478c5f8e7248d67c3c079695d5a/bekujanidiwezexemojazu.pdf In PDF document text
- http://agnieszkapawlik.com/userfiles/file/duwipawopifafamox.pdfIn PDF document text
- http://cdmvt.cz/sites/default/files/jofikiren.pdfIn PDF document text
- http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a6bc8d8---vukufenorovereb.pdfIn PDF document text
- http://asiadomainstore.com/userfiles/file/nemofemanolakilawifetok.pdfIn PDF document text
- http://biplano.eu/userfiles/files/ranezuvipedeg.pdfIn PDF document text
- https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rpbrb1p33lkisbnr425pvm6f59/9188326078.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc32fcb9b5354604da489b5a37e17fce/13233451574.pdfIn PDF document text
- https://finliz.lt/i/File/nutusedagaleraxanumapegir.pdfIn PDF document text
- http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/sogugirafujekavam.pdfIn PDF document text
- https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc26b85ea---99244161593.pdfIn PDF document text
- http://vitrine-prof.com/files/15545791503.pdfIn PDF document text
- http://caopump.com/admin/userfiles/file/47981304492.pdfIn PDF document text
- https://plentis.eu/ckfinder/userfiles/files/duperobefakonetezibizunot.pdfIn PDF document text
- https://goodluckfishing.com/ckfinder/userfiles/files/wazavadevizajuropaliga.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5d5393c42eebc3da187ec040d97cc288/navop.pdfIn PDF document text
- https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88ed4df0d---guzokumotinanuzipeb.pdfIn PDF document text
- http://partner-support.net/user_data/userfiles/files/pomuwuxomile.pdfIn PDF document text
- https://boyanbolyarski.com/userfiles/file/dilajogurupamubulof.pdfIn PDF document text
- http://short-story.ru/upload/file/89303000423.pdfIn PDF document text
- https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6c500710ed977a74269331fdeb9df7d7/18406325794.pdfIn PDF document text
- https://phucatgarment.com.vn/ckfinder/userfiles/files/refurunofupup.pdfIn PDF document text
- http://chaukitchen.com/uploads/files/xutoza.pdfIn PDF document text
- http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/3238125689.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=definition+of+conversation+pdfPDF 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_off0000e2c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2C1	17900 bytes
SHA-256: `3ad45e6e3f73fca8f04ef69ade6d144399d1d723eb5e427d8c1496dbbc7fe444`
`font_01_sfnt_off0001109e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1109E	10636 bytes
SHA-256: `367fb136203317bbfa9e130df37e9d81f5b3b0197e0784c45d197e8df277dd8e`
`font_02_sfnt_off00012925.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12925	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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