PDF malware analysis — malicious · e28352c5160f5961

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 14:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 85c27b21d3077f3dd3cd82a8b9f398ee SHA-1: b13fe87f2d0c599a013ea27624e5bce69e914ff3 SHA-256: e28352c5160f59619a583b8a30e1e9f5d452e8a1bede79d06aa11db6d632b7e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to external, potentially compromised, sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9912

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d85368ec9f8dc624b742e7ec62abf790/62863995770.pdf In PDF document text
- http://wellfoto.cz/pictures/files/tojevepizapokowenuwotebe.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17c387bba1f04cb73bb7f4f440232971/30659342403.pdfIn PDF document text
- http://aitrans.org/UploadFile/file/F1202105211218472600.pdfIn PDF document text
- http://kasintorn.com/images/upload/files/5834574724.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/272bfcbfdd960e91d97f57caf8ffe0bd/38478890660.pdfIn PDF document text
- https://drrajanmahtani.com/userfiles/files/muxebepidenekegakuf.pdfIn PDF document text
- http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m1498ho0hk686cpl54h7c8rbf1/towuselazowejigop.pdfIn PDF document text
- https://pezenasenchantee.fr/userfiles/file/16736073301.pdfIn PDF document text
- https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d005ecb5793---28378391047.pdfIn PDF document text
- http://destockbaby.com/ckfinder/userfiles/files/42355286137.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3aa89b2e08290b6ab49b2106ff44389a/97083647548.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/9724194081.pdfIn PDF document text
- https://novamakine.com/upload/ckfinder/files/kalokopimasi.pdfIn PDF document text
- http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160753b639dcd8---4862167252.pdfIn PDF document text
- https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a18530db08f328375f3df8bd79b9bd1/kolexuxividurizebosotur.pdfIn PDF document text
- http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da4c58a062---95744085416.pdfIn PDF document text
- http://idroter.org/userfiles/files/76059208772.pdfIn PDF document text
- http://risme.vn/files/vujuvebonawalumoruram.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7235da98ef---22932200279.pdfIn PDF document text
- http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/fc5484f7507d76dd7cf9ec28b263ecf9/47553094068.pdfIn PDF document text
- http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25019141259.pdfIn PDF document text
- http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072b13697cfa---40150917310.pdfIn PDF document text
- https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/64cc9804c54bee98794dfde7ceef303d/mujuvaligojekerat.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/37nbv10fkmk2r9fq9e1gc7khv7/6612280038.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300c05b4b42---powilosoxaw.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=banco+de+preguntas+ser+bachiller+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_off0000e19d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE19D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f9af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AF	19600 bytes
SHA-256: `eaa91263d53602f03040f50591f1e14d7aa20ad8de157be0c046d523b97a1106`
`font_02_sfnt_off00012bf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BF9	11192 bytes
SHA-256: `3cc5bbcc7a644bf9f5e1eace335d1795389f90ec95252b7d1ffdf3b6b13b78f1`

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