PDF malware analysis — malicious · 9a5f281281fbe81f

MALICIOUS

PDF

101.2 KB Created: 2021-07-15 20:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 02e349e1b45a112ce47e098a22164e49 SHA-1: 804af5aaf9427f9f42cc5a538aacdaa33e8a3593 SHA-256: 9a5f281281fbe81f5a1454adbbc3fdd66e3a86d0478c961bc2aede5103c55188

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9803

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.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7e3019536---3592049105.pdf In PDF document text
- http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e621181bd2d---26759239152.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7616b70acd045a53def820e8ea18ae93/9302077135.pdfIn PDF document text
- http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaperutukol.pdfIn PDF document text
- http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/72137657654.pdfIn PDF document text
- https://fanaf.comarticle_ressources/file/povanakomiboj.pdfIn PDF document text
- https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970bc31108c---dobirepusi.pdfIn PDF document text
- https://marljivo.hr/userfiles/file/6151666765.pdfIn PDF document text
- http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be6d2a78a6a---40654952192.pdfIn PDF document text
- http://mousike.it/img_ins/files/jokozemukimeb.pdfIn PDF document text
- http://55pluscommunityspecialist.com/userfiles/files/kuzibevetakedifem.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce46b5892ef---dudakusa.pdfIn PDF document text
- https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac375037e---bojawelivonepotujirumara.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e7b890ef7---zadufidurovulo.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6e0b2932015a1f143f8b56d8bfde4e9f/37983299053.pdfIn PDF document text
- http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c91c2649ac99515b17ebc911e8094083/59510490180.pdfIn PDF document text
- http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/fumododixawepumiwujinil.pdfIn PDF document text
- http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16074723e9506a---33812278949.pdfIn PDF document text
- http://superfishinglewood.com/uploads/files/73655548068.pdfIn PDF document text
- https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/04314ec996b5aefeef7e0600f20db5f1/kanajepoketer.pdfIn PDF document text
- https://artbynela.com/uploads/file/14075940255.pdfIn PDF document text
- http://gokea.org/upload/editor/files/goruvomuwabukotibesila.pdfIn PDF document text
- http://irinaburmistrova.ru/files/xaritotufegepelubixifefir.pdfIn PDF document text
- https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/102bbd8e5dc5f75e9500ef3bf3105205/xowizezuzapasowovulofeb.pdfIn PDF document text
- http://ankurgroups.com/userfiles/file/felowomalizidisox.pdfIn PDF document text
- http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a25938a5---56545488434.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=decomposition+reaction+chemical+equationPDF 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_off000127fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127FA	10888 bytes
SHA-256: `48dd22f9d4cc5b0499203039139ab645b02789c46d2bcd0713f8e8b6d8b78ae3`
`font_01_sfnt_off000140ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140ED	17224 bytes
SHA-256: `69ccc280ddc5166112726e0badadeb3df9bb9430db559bab2a98602f43e06b28`
`font_02_sfnt_off00016d40.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16D40	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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