PDF malware analysis — malicious · a0e4b56d255ca08d

MALICIOUS

PDF

78.5 KB Created: 2021-09-21 23:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: b758cfffa4e6236ff101c65180e044b0 SHA-1: a799351203adfce7ef21843d155e889c4027b36e SHA-256: a0e4b56d255ca08d34512142da830f227d97293af01d8fe305ced4f586fd355a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, likely to distribute further malware or conduct phishing. The embedded URLs suggest an attempt to trick users into downloading software or visiting malicious sites.

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 https://krisoc.ru/uplcv?utm_term=hisuite+pc+software+download PDF link annotation
- https://bahia-group.com/ckfinder/userfiles/files/33607915253.pdfIn PDF document text
- https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a67472ef---61630514540.pdfIn PDF document text
- http://gevenschoenen.nl/ckfinder/userfiles/files/3477762167.pdfIn PDF document text
- http://nattukoottam.com/userfiles/file/temafowubudarufajaze.pdfIn PDF document text
- http://prochem.vn/images/uploads/files/xisidubugalas.pdfIn PDF document text
- http://xedaphcm.com/luutru/files/tuwasugeloliwomuv.pdfIn PDF document text
- https://art-eria.pl/mandarynka/pliki/files/74890459507.pdfIn PDF document text
- http://sarigol.kr/userData/ebizro_board/file/64097990743.pdfIn PDF document text
- http://novena99.com/uploads/files/202109080452559609.pdfIn PDF document text
- http://thangmayedex.com/webroot/img/files/fakujavalilirunofufodi.pdfIn PDF document text
- http://fbrasil.com/userfiles/file///tosutologuzawidub.pdfIn PDF document text
- http://driver-jazda.pl/upload/file/63462740920.pdfIn PDF document text
- http://fujieshubao.com/zk/UploadFile/file/2021091515310373499.pdfIn PDF document text
- http://eamenfaraz.com/cache/fck_files/file/55438214224.pdfIn PDF document text
- https://webtechnocrats.com/upload/file/xavodozabawedupivudakikug.pdfIn PDF document text
- https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/94d561939076f4af6d27fcb83bfab769/99424608639.pdfIn PDF document text
- http://topimmigrationlawyer.org/ckfinder/userfiles/files/35368419623.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ca72f985---sojorim.pdfIn PDF document text
- http://www.salpasafarit.fi/tiedostot/files/88533126480.pdfIn PDF document text
- https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jir7rv3e5lbbemv8tmls20k9g5/26548549424.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144555bb8837---jezutaxekevume.pdfIn PDF document text
- https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a244ef21315dfaddd78990f515aaefac/gijuzoginozifexulovem.pdfIn PDF document text
- http://bodybybodyology.com/ckfinder/userfiles/files/nikikiwamaw.pdfIn PDF document text
- https://dobre-akce.cz/media/files/file/sewugozaroz.pdfIn PDF document text
- https://jagominum.com/contents/files/mipekalabupetomowe.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_off0000cd33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD33	17840 bytes
SHA-256: `f61456aa4f3256f78a415de6597358f45d9e4f38004f2f7284b99c5d2df172e8`
`font_01_sfnt_off0000fb59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011370.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11370	10792 bytes
SHA-256: `919e89740d65bca03bcf52d29881ac0bbe570985b62fdc815e70c050a21fcfbc`

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