PDF malware analysis — malicious · 9c933d260e455db6

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 20:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 2ce762cbec8ddfe625b60423c294f83f SHA-1: 6b9c9e3a31a1d680226210d3c09e285ce6476d44 SHA-256: 9c933d260e455db6337ee563be6542290a0ffe74a800f5bb5913effdfcfab333

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of attempts to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/73582804380.pdf In PDF document text
- http://klimatyzacjaradom.pl/userfiles/file/xejudawujaji.pdfIn PDF document text
- http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f796b5b65f---jakike.pdfIn PDF document text
- https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35208d0baf---lonegebukaridezipopumurok.pdfIn PDF document text
- https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/74d13fa7512fb24ba8bff421ad260ecc/tajevekonateme.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8df2b970f8e994e5a97319eb068b1741/51720878785.pdfIn PDF document text
- http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/navevenilip.pdfIn PDF document text
- http://bafiti.com/sklep/userfiles/file/tavabe.pdfIn PDF document text
- http://vnos.vn/app/webroot/uploads/files/gakagofedujigapoguwijij.pdfIn PDF document text
- http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d24a1c894---95876044655.pdfIn PDF document text
- https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117147f6e29f---kavivowebegibukedogubuneb.pdfIn PDF document text
- https://summit-christian-academy.com/scauserfiles/files/7165759475.pdfIn PDF document text
- http://maciejabramowicz.pl/upload/files/file/5464332394.pdfIn PDF document text
- https://almuhja.ps/ckfinder/userfiles/files/26342240409.pdfIn PDF document text
- http://altinay-law.com/images/file/dozagetapodu.pdfIn PDF document text
- http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/h29m7havduvug2djq87n3t1pv3/51819150711.pdfIn PDF document text
- http://osoboebludo.com/ckfinder/userfiles/files/28575504839.pdfIn PDF document text
- http://ontsgoi.shop/uploads/files/rebiwurafiredirejofidazo.pdfIn PDF document text
- https://mo-space.space/web/img/podborky/files/30312317162.pdfIn PDF document text
- http://sarljarry.fr/userfiles/file/85361025310.pdfIn PDF document text
- https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4914df7d68bc8e69aebf0ffde5d44170/dorunimirokigoz.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0da835d9---3203478237.pdfIn PDF document text
- http://noithattamphuong.com/upload/files/93573600201.pdfIn PDF document text
- http://meruzhankhachatryan.com/app/webroot/files/file/64599568340.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083178768638---63590235870.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=grade+6+math+algebra+worksheets+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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dba9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBA9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f3bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3BB	16472 bytes
SHA-256: `487ce8851fbdc16286c1e67a00b27835b33ff67ecf3a3481c4680e54ed85b939`
`font_02_sfnt_off00011e11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E11	11276 bytes
SHA-256: `b9b4e2ba2d59d2eec01126d60c55df83014eeee031c50acd6202d269dc9c99e0`

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