PDF malware analysis — malicious · 44be07e02a699ac0

MALICIOUS

PDF

94.8 KB Created: 2021-08-01 00:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: 70fb8f465661b0230ff368f2e864fffa SHA-1: 1108c8c6be4c202422c0541b4278e4d3e1a04cb3 SHA-256: 44be07e02a699ac0b541da50b55e57e01f74700e351e3d844fb05ede903a49a6

212 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and numerous links to external sites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The presence of heuristics indicating a 'Password-protected archive handoff' and a 'Visual download / call-to-action button lure' suggests the document is designed to trick the user into downloading a password-protected payload, likely a malware dropper. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 9

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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
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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://krisoc.ru/uplcv?utm_term=magic+bullet+hack+pubg+mobile+android+download PDF link annotation
- http://bradzo-ep.com/uploads/files/jaseb.pdfIn PDF document text
- http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805c0ca6a---12122108695.pdfIn PDF document text
- http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/5640424879.pdfIn PDF document text
- http://tingyi-bnb.com/CKEdit/upload/files/nelejaroripuze.pdfIn PDF document text
- https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e18af00ca3b---zafenulodekukorefu.pdfIn PDF document text
- http://www.dilipprabhavalkar.com/images/file/zumoz.pdfIn PDF document text
- http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8982c95df0672b54937334db26e8a1ca/melejobawalexixotudebo.pdfIn PDF document text
- http://milwaukee.center/userfiles/file/98908717291.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/16942982453.pdfIn PDF document text
- http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2cb75f1769---46495887461.pdfIn PDF document text
- https://novzelandiya.ru/ckfinder/userfiles/files/nekopeferarebojolunedavi.pdfIn PDF document text
- https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160e571564f2ff---ridufibu.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/82344000113.pdfIn PDF document text
- https://transilvaniafishing.ro/app/webroot/files/userfiles/files/91330658205.pdfIn PDF document text
- https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/e08881f44bb8c2820169ddddf07b7559/76614009743.pdfIn PDF document text
- http://to-kajihan.net/js/upload/files/raxikoziwekuj.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15cb6b8d95---41216164013.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
- http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f757bbe6e---gilolinogesifexobuwo.pdfIn PDF document text
- https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8vjoqaeprbkbknbacd3vkatdgi/95573673694.pdfIn PDF document text
- https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/48efe0045310468365b2e6dcc6f66bbb/19684989437.pdfIn PDF document text
- https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721de5ae63f---64718149693.pdfIn PDF document text
- https://ceccargiurgiu.ro/userfiles/file/jaledoxatosato.pdfIn PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lt5if18uq85ssplk4u8u1meef/11655102790.pdfIn PDF document text
- 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
`font_00_sfnt_off0000ef0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF0F	16336 bytes
SHA-256: `d53e16990f1fdc71bbc0f4a8748f65c80301508f666e15066d4f010b7e6a5cc1`
`font_01_sfnt_off0001054e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1054E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011d60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D60	19852 bytes
SHA-256: `c280b8ef996cce0cfd2f77f8b46cfa70d84db2d378c62382f1ab677852762645`
`font_03_sfnt_off00015061.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15061	11204 bytes
SHA-256: `b8bbeb1d05e3308e9e9bbf9b98d6c0519c897ab26a7fe2f0b1321029f5b25b58`

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