PDF malware analysis — malicious · ef8b382f27955cab

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 19:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 12918b0ca7dd16e807c19d7c097c49e4 SHA-1: 04baf6e503086106ebc985e91ac724f64782292a SHA-256: ef8b382f27955cabb8f47fc65b690b56c2bf0e5f63b2dec15d0c96efa2bdf720

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9761

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://youngshiny.com/userfiles/file/1627653627.pdf In PDF document text
- https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sjpnng3g0bon41kc2rk431sat7/bugisevugasutipu.pdfIn PDF document text
- http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3e023cb1---90751433375.pdfIn PDF document text
- https://micsys.in/userfiles/file/xibomutugazowirom.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed4c86bebe---sulesakazisubopofajof.pdfIn PDF document text
- https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6fd2092f2---wutakagosig.pdfIn PDF document text
- https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/8rni083ecq07tkqkmg37p15tf3/bawow.pdfIn PDF document text
- http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/o9lchaucs4m9lkqm1pfrqr4nd7/89457069776.pdfIn PDF document text
- http://tutaylamhet.com/storage/ckfinder/files/xanirepu.pdfIn PDF document text
- https://cvconstructionsgoa.com/pharma/admin/userfiles/file/gekidulovudedu.pdfIn PDF document text
- https://pharmalogindia.in/ckfinder/userfiles/files/6448812183.pdfIn PDF document text
- https://hosrem.org.vn/ckfinder/userfiles/files/wamemuriderizolonegod.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d8d53ae156a7756ea1f5a499a8f964d7/57297014333.pdfIn PDF document text
- https://prana.video/wp-content/plugins/super-forms/uploads/php/files/6g3irsgouonr73mnkmchg30584/nitosejilonoduledidipinu.pdfIn PDF document text
- http://ajtoablakcentrum.com/_user/file/28906200953.pdfIn PDF document text
- http://manixcnc.com/ckupload/files/37200746576.pdfIn PDF document text
- https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b5b8900a62ee58c5c28fbbb9a9c9d1f/parewanaviwiduv.pdfIn PDF document text
- https://digireg.dk/upload/20754025213.pdfIn PDF document text
- http://1qjd.com/upload/files/2021-07-30-02-11-25-OeIpmvYA.pdfIn PDF document text
- https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bff1a8423---33209477423.pdfIn PDF document text
- http://lasfyy.com/uploadfile/file/20210901064222409.pdfIn PDF document text
- https://lncl.org/ckfinder/userfiles/files/bopexujedapo.pdfIn PDF document text
- https://bushregenerators.info/userfiles/files/jabilivisem.pdfIn PDF document text
- https://aokman-drive.com/d/files/63441563970.pdfIn PDF document text
- http://asijskepotraviny.cz/files/file/1975166644.pdfIn PDF document text
- https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6794278c9---38637404465.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=almanca+zamirler+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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off000109ec.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x109EC	17928 bytes
SHA-256: `5d5dc0fdcff33486fea3c5594a1045ff89a40cc381fc2fa4385f6a2f52a36fa0`
`font_00_sfnt_off0000da3f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA3F	10436 bytes
SHA-256: `5ac610738ae1d469f9bd4040b9a4a86fcf8b54ffd1405cc0fe8e8451eb7d37ed`
`font_01_sfnt_off0000f1db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF1DB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off0001260c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1260C	20328 bytes
SHA-256: `1348a2c6e2e27044c72e56abbf36a634ffccec97bd04fe5bec93aa47040a42f6`

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