PDF malware analysis — malicious · 31ded7495a4b1f07

MALICIOUS

PDF

152.7 KB Created: 2021-07-21 09:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 94d20ecd66aa79ff681e72a7c17258e8 SHA-1: 10f022047072d2a60721d4aefaa6492d1479d999 SHA-256: 31ded7495a4b1f073042fc77c3276bc589541dffb7475f3fcf08b627086d3ab3

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm used to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links point towards exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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://3dsami.org/uploadfilefiles/37300553612.pdf In PDF document text
- http://valleypainclinic.org/userfiles/file/99815884156.pdfIn PDF document text
- http://stressmanagement-karriere.de/userfiles/file/92302951634.pdfIn PDF document text
- http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b51d1d02c---39506479711.pdfIn PDF document text
- https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/t052d61nul9hui6bmkprlibubv/88285063401.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/71762784569.pdfIn PDF document text
- http://blatt-gruen.ch/files/gawaxekidak.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/81297be90318d256a1ef7f3995d3be05/19418174393.pdfIn PDF document text
- https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f4c9b353---gilurujibeditafuw.pdfIn PDF document text
- http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a5bee6813---13720791011.pdfIn PDF document text
- http://manavpublicschool.org/manav/userfiles/file/52882392336.pdfIn PDF document text
- http://hzzxtl.com/UploadFile/file/20210616043206648.pdfIn PDF document text
- https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0751893d92e41ee3eb1c978e2f78533/26041021670.pdfIn PDF document text
- https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c69e2a021---boxadometagez.pdfIn PDF document text
- https://bwawarszawa.pl/upload/file/tabigibubogosumebenavuru.pdfIn PDF document text
- https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/03406269b7277c50969483c3b8085d4a/puzoledubut.pdfIn PDF document text
- http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/7lfteh29ml8gtnn8m58d96afjg/45413816870.pdfIn PDF document text
- https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160907b001d6eb---67937978622.pdfIn PDF document text
- http://momsystem.ru/public/file/mujijelotabizibinegot.pdfIn PDF document text
- https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/fadff781c29ef3828770b58b8169441c/71265183411.pdfIn PDF document text
- http://sieuthicayxanh.vn/webroot/img/files/45150580198.pdfIn PDF document text
- https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/061ac0943cb136a727a63e98cef90101/nuripeturanogemi.pdfIn PDF document text
- http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/16890525337.pdfIn PDF document text
- http://chapelguild.com/images/usr/xiwedimag.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=a+picture+of+an+uncircumcised+penisPDF 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_off0001f1aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1F1AA	19176 bytes
SHA-256: `224d0016c920246453bb8f49ced30b40e3f08d1a8c9367d3728ab105bfe37521`
`font_01_sfnt_off0002240a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2240A	10816 bytes
SHA-256: `13a2ad45924e7016aa327fcfd91feee78e5f254d20687eeee18c63b273a75ca6`
`font_02_sfnt_off00023d02.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x23D02	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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