PDF malware analysis — malicious · 743024191caf599f

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 07:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: db4c567e57200fbcaaa7cc90d0b66589 SHA-1: f54ecb1d31ec2369c3834802c01bc2e7831d1041 SHA-256: 743024191caf599fe751f64bd6aaa707f5ae66a0565d75c9251922fd6d5c0991

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=dracula+chapter+1+pdf PDF link annotation
- http://wami.cc/data/files/80132898451.pdfIn PDF document text
- http://jedzenie365.pl/ckfinder/userfiles/files/falanuzol.pdfIn PDF document text
- http://cross-winds.in/upload/contents/images/images/sewexub.pdfIn PDF document text
- http://kibunajcc.com/ckfinder/userfiles/files/30490211321.pdfIn PDF document text
- http://aktasmatbaacilik.com/resimlerfiles/kisidisomu.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16150b519a735b---lexatuxatuwuwege.pdfIn PDF document text
- http://studiopol.com/userfiles/files/menesaromoxefivejovarifoj.pdfIn PDF document text
- http://kidneytracker.com/ckfinder/userfiles/files/73914673077.pdfIn PDF document text
- https://angkorphotographyguide.com/userfiles/file/6980761192.pdfIn PDF document text
- https://almuhja.net/ckfinder/userfiles/files/21002665435.pdfIn PDF document text
- https://biroestarsa.hu/uploads/file/govonijawoxarolixirusi.pdfIn PDF document text
- https://traffictkt.com/viking1/uploads/files/6795097060.pdfIn PDF document text
- https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f9d305b12731fa0ff37b213f31c5b038/69473738337.pdfIn PDF document text
- https://jpt.mysmartedu.com/uploadimages/files/kabasokadopozuteba.pdfIn PDF document text
- http://britishcytology.org.uk/ckfinder/userfiles/files/minodiwitutuma.pdfIn PDF document text
- http://artiguardia.pl/userfiles/file/46949279711.pdfIn PDF document text
- http://abc-tel.ru/data/File/39439841022.pdfIn PDF document text
- http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95523804690.pdfIn PDF document text
- http://automsystem.com/UploadFile/file/20211001093432400.pdfIn PDF document text
- http://hotel-gerard-dalsace.com/upload/document/pokijozaxomuxevasej.pdfIn PDF document text
- https://charterfori.ir/basefile/charterforiir/files/11983928936.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/dc36c70612c88553c137155c057edf89/zakokavovitipazuxe.pdfIn PDF document text
- https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538eeb30190---38831497568.pdfIn PDF document text
- https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f458ae498e---42547902293.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16150ade480c25---15481783730.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_off0000b44c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB44C	10384 bytes
SHA-256: `c40500e0feb6168da33274064e68530b2014af43434e5625466ce9fbe09176d3`
`font_01_sfnt_off0000cbfb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBFB	14800 bytes
SHA-256: `976bdda47c7cae49899cafa3d92e3f08811bff7f7df5deb99dedddcec5bb7684`
`font_02_sfnt_off0000f0f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0F6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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