PDF malware analysis — malicious · 9a1f5432a377135e

MALICIOUS

PDF

94.9 KB Created: 2021-06-26 05:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 67daa38c14198e68401f415d72aceb5d SHA-1: 38814360d28ca16b965f168e333fc36f2a56c4b4 SHA-256: 9a1f5432a377135e9b53b7b07582519bd1cdc8ef7b99e928a5cc0f6eda7e6b52

256 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits multiple indicators of malicious intent, including a fake CAPTCHA lure and callback phishing elements. It also functions as a link farm, pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly support its classification as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9918

Heuristics 9

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
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://irlanc.ru/uplcv?utm_term=bov+opening+hours PDF link annotation
- http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd70507bc---viwifavavukotubavekanofo.pdfIn PDF document text
- https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5cf5859f439919ab8bf2119f2d7b6a8e/donipuxuvuvejuwujekegita.pdfIn PDF document text
- http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f18ca62d---xogezolakuwitaj.pdfIn PDF document text
- http://softwarefactory.nl/images/file/8082535105.pdfIn PDF document text
- http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803037a8964---28204766211.pdfIn PDF document text
- http://nicolalazzarotto.com/userfiles/files/56157905061.pdfIn PDF document text
- https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1e35d65c93823c7edca3f70f1935ede8/82863603303.pdfIn PDF document text
- http://bhttourist.com/upload/fckimagesfile/9049389730.pdfIn PDF document text
- https://autoprofi.ua/userfiles/file/66016055236.pdfIn PDF document text
- https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b19001ae5---kepopalolovevo.pdfIn PDF document text
- https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/16c016ec9fa8f7466c2cabbb68c35f73/tipunusir.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/4cu6fh6lmrcntkqnh4rqdd29d4/kadedotojezopugadebudefa.pdfIn PDF document text
- https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/077880e336c6ea942b9e352ac1c6db15/remuwevadufoninugutuditim.pdfIn PDF document text
- http://seoulsquare.com/userfiles/file/ririxeriwike.pdfIn PDF document text
- http://holidayinntorino.com/userfiles/files/goronag.pdfIn PDF document text
- https://securityguardsupply.org/php/uploads/file/6680494940.pdfIn PDF document text
- http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd456e9bf---saxegejapivonemivexir.pdfIn PDF document text
- http://ags-sib.ru/ckfinder/userfiles/files/pimerijotiga.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5135e0190---79634933682.pdfIn PDF document text
- http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb00e2b299---ruvoduzavakaxonovolegedod.pdfIn PDF document text
- https://copperscraphandlers.com/ckfinder/userfiles/files/95003292849.pdfIn PDF document text
- http://fine-cottage.ru/userfiles/file/5323943146.pdfIn PDF document text
- http://baigeleather.com/userfiles/file/zenotufepilupup.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/5dc3ebbeb56e90ce25d24c87f67d44d0/26402285812.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_off0000f804.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF804	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00011016.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11016	19228 bytes
SHA-256: `4d2e6e4284f6929f73c53097c37c5f7624561c80a4d7e59db7ce816ab8e38051`
`font_02_sfnt_off000140ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140EF	10444 bytes
SHA-256: `42c04022633303c69e3e60bfa1485f0803b398ce01285edb1e653e4d11b54c0f`
`font_03_sfnt_off0001588f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1588F	16204 bytes
SHA-256: `2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489`

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