PDF malware analysis — malicious · 937361b807a4fd2c

MALICIOUS

PDF

84.9 KB Created: 2021-07-07 22:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 1d2826c18301461a143859c5dc3cda4a SHA-1: 925cd7186ede7d093693deb40f4315477bfe462d SHA-256: 937361b807a4fd2cc82bb7c240600f6ec43427c2c83b73588fd3ef1f9f390c2d

236 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains heuristics indicating it is a link farm hosted on compromised CMS upload storage, likely intended to host malicious files. The 'SE_BROWSER_INSTALL_LURE' and 'SE_PASSWORD_ARCHIVE_LURE' heuristics strongly suggest a social engineering attempt to trick the user into downloading and decrypting a payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba96cc5450c---74398012191.pdf In PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c005ab2c03---pemumotuwunimigijip.pdfIn PDF document text
- http://4998horo.gmmwireless.com/contents/files/xuguxobaxis.pdfIn PDF document text
- https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4be9768633---68277524224.pdfIn PDF document text
- https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720bf887d9e---sisafeduz.pdfIn PDF document text
- http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f1e0208d5---87426173456.pdfIn PDF document text
- http://anhuifan.com/upload_fck/file/2021-6-23/20210623033636252908.pdfIn PDF document text
- https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cc21ee084efcd892acdc0659bbfa51a8/ginarot.pdfIn PDF document text
- https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/58850bde7742c7d1012497362da55040/72563272823.pdfIn PDF document text
- http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609202655aaf3---84001410775.pdfIn PDF document text
- https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/582b180734697aa1f88a178e92b5c381/35528070265.pdfIn PDF document text
- https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/t9tmjk73nk9ii63door4e88bv5/12523204776.pdfIn PDF document text
- https://accesoriosalmayor.com/images/userfiles/file/xukomixapalumedeles.pdfIn PDF document text
- http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebcfeb14fe---wuzivuwokanisawitaxuji.pdfIn PDF document text
- http://turinhotelcompany.com/userfiles/files/8513731040.pdfIn PDF document text
- https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/f2ac406baa30753ecf6821ee2abdef6a/wuvajodevumi.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b70a4591d---bimetefusin.pdfIn PDF document text
- https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2f8afef1ddf64d997bd6ebe5bcecde50/84716646846.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071220b00d90---49196611570.pdfIn PDF document text
- http://gorillatheory.com/admin/upload/file/46070311731.pdfIn PDF document text
- http://pinzimoniofiumicino.eu/userfiles/files/6116753467.pdfIn PDF document text
- http://fittbikese.hu/files/file/sogikubanenunesarilu.pdfIn PDF document text
- http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdfIn PDF document text
- http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607758cdb51b5---gusugamenebizamamoniduwa.pdfIn PDF document text
- https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3al6hpeec3hvt8jsfa1rgpdbmc/kosizifajonamodobozidutu.pdfIn PDF document text
- http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c54c678e5f0---limaxixep.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+hack+pubg+wall+hackPDF 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_off0000eaa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEAA3	16820 bytes
SHA-256: `073e850934bf5393c7b86a348fd779fc9017f6776ead51db0191ac4167e12e57`
`font_01_sfnt_off00011642.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11642	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012e59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E59	10464 bytes
SHA-256: `da071987e456a8651897934d036d99a15ff1bb0f75f9a6be152671ee7e806a08`

Open this report in the interactive analyzer, or submit your own file for analysis.