PDF malware analysis — malicious · 3a77c6600df5fe4c

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 12:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: f85f1b1415f5e6271a649b49bae1e4bd SHA-1: 77c9abcb253b38c2c72ebfd83897eb116796ce76 SHA-256: 3a77c6600df5fe4ca2a4805d8a6053a0cea91300fa039af3227b2feb86929831

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9949

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://royalrep.com/userfiles/files/6588921983.pdf In PDF document text
- http://beauty214.com/uploads/files/202109102322053142.pdfIn PDF document text
- https://fenicia.uy/fenicia.com.uy/uploads/files/11272846451.pdfIn PDF document text
- https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/40ca034c33c6cc6570810ab6cfabc60a/82589725955.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419fc0a3a45---15861542046.pdfIn PDF document text
- https://rpdev.org/ckfinder/userfiles/files/dopazixujefijobikizatas.pdfIn PDF document text
- https://cnn-logistics.com/asset/files/xopafoxidulikidopinomela.pdfIn PDF document text
- http://hoachattn.com/image/files/tebukolaratojewewunadodok.pdfIn PDF document text
- http://circolosilverblufitnessclub.eu/userfiles/files/36829225855.pdfIn PDF document text
- http://hantechwelding.com/userfiles/file/2021090718044373499.pdfIn PDF document text
- https://echipamente-scule.ro/userfiles/file/wejod.pdfIn PDF document text
- http://www.taxivanclass.com/uploads/ckfinder/files/zesefutijojuw.pdfIn PDF document text
- https://o2opr.co/userfiles/files/bugasakigorofelikewuda.pdfIn PDF document text
- http://ceresasrl.it/userfiles/files/vugejuperawugisetulag.pdfIn PDF document text
- http://gearcon-eng.com/file_media/file_image/file/41540362000.pdfIn PDF document text
- https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432fc81df9d---damapomipikex.pdfIn PDF document text
- http://geombiagioschettino.eu/userfiles/files/bilopipiju.pdfIn PDF document text
- https://sdhouse.info/ckfinder/userfiles/files/mabemikapagapelutupabep.pdfIn PDF document text
- http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93d10fac2---zigubinotatagipaxavapu.pdfIn PDF document text
- http://s2group.pl/userfiles/file/xaviwotuxukezego.pdfIn PDF document text
- http://dsraxys.com/uploads/pojujuzopuribazegopubewug.pdfIn PDF document text
- http://condosworld.com/abisol1/userfiles/files/26944097116.pdfIn PDF document text
- http://synergyproperty.com/images/files/31982299147.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161322dcb7096d---wukakofosi.pdfIn PDF document text
- https://totounited.com/contents/files/mobuvekogolin.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=buy+t+mobile+phones+for+cheapPDF 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_off0000cb63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCB63	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e375.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE375	17616 bytes
SHA-256: `7a8f293e53932ce5ef4448316635b177fcc00f66b349939935baaec7607ccda1`
`font_02_sfnt_off0001119e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1119E	11152 bytes
SHA-256: `1efb1d726f737d399d19bfa29c79df838066cad6a955b893ed3ca8c0f2af8f45`

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