PDF malware analysis — malicious · 871ec548a479864a

MALICIOUS

PDF

76.7 KB Created: 2021-07-31 07:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 95a54624f6fac319e01a65c3941ae599 SHA-1: 6e0c2577c959b0c48acebfa59e33e0123de63992 SHA-256: 871ec548a479864ad122d0310439525eeba7261573de222081e466ec4e758a6b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its use of disposable hosting and SEO-related redirection tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9954

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=zettili+quantum+mechanics+solutions+chapter+2 PDF link annotation
- https://pet-fashion.ro/mm/file/64061343797.pdfIn PDF document text
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/369fc4851ef7ea29ab6881c13046bec2/88911356861.pdfIn PDF document text
- http://shengnabei.com/uploadfile/file///2021060601581120.pdfIn PDF document text
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qs6ud99muecc7qk1ivqddruj3i/12094288159.pdfIn PDF document text
- http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/fuwewafewivefobug.pdfIn PDF document text
- http://eortak.com/img/fck_temp/file/mojabosir.pdfIn PDF document text
- http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160910cfc413b3---ribizixikakevilafonoz.pdfIn PDF document text
- http://szzxwx.com/Upload/Upload/file/2021617129476444.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/8ek55h54l34f7ou4ekrc84gqr7/nujuguvup.pdfIn PDF document text
- https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0404ec259---6559916703.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e664b0d4---najobutodamubabopatozep.pdfIn PDF document text
- http://ateliergermain.net/sites/default/files/file/letaxobenadezefusazufe.pdfIn PDF document text
- http://modaxch.com/userfiles/files/zomusosagadumo.pdfIn PDF document text
- https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/78a910bf7d1f1aeb28d1b2a76cb02e00/46635573264.pdfIn PDF document text
- http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a51630cebd5---78723089328.pdfIn PDF document text
- https://wendi101.com/userfiles/file/dufasogaboxakininofas.pdfIn PDF document text
- http://jrpst.pl/userfiles/file/donofixinagorevupezoben.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/17761651161.pdfIn PDF document text
- https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/37fc0571e680e75dd0a63f6dba4b3bd8/bazinamijoxufukaw.pdfIn PDF document text
- http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66694e5fb---95463885715.pdfIn PDF document text
- https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d110505f3cf825874f87a658aedf6194/97499368013.pdfIn PDF document text
- http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c412633f2d---97369531320.pdfIn PDF document text
- https://floridagreatescape.com/media/file/tipimom.pdfIn PDF document text
- https://arerp.kr/data/file///goleregakogavusina.pdfIn PDF document text
- http://saydersan.com/firma/files/15602140477.pdfIn PDF document text
- http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aecb79530d4---xedegenuparepamamadijeve.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_off0000c900.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC900	10968 bytes
SHA-256: `e901b84070514c84d1f0c6069535ba816fb4d69c467512316059fd3329f6b277`
`font_01_sfnt_off0000e24f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE24F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fa61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA61	16140 bytes
SHA-256: `b3bf53c09ba5cf30d3c6b55885e09ac0eb7170995e996df355a1d53651e36b42`

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