PDF malware analysis — malicious · 5739ea32bf0a640f

MALICIOUS

PDF

92.3 KB Created: 2021-07-07 20:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: f1c9c4d43cfffbec374d20b66d921fab SHA-1: a7c5cebe1ff846324584c2c3f7c3da0ed4fe4b28 SHA-256: 5739ea32bf0a640ffac2d277b50e199371618aaad0e65658d4922dba106221a0

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload locations and disposable hosting sites. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 https://nomylo.ru/uplcv?utm_term=things+i+know+to+be+true+rosie+monologue PDF link annotation
- http://blessingsngo.in/userfiles/files/xefulifamutuvujuridefira.pdfIn PDF document text
- http://bjsprt.com/uploadfile/file///2021060802534614.pdfIn PDF document text
- http://merwepizza.com/upload/file/watutenalitomunex.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bbedf49fe3c---pusavar.pdfIn PDF document text
- http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609907fa4a4d8---58707608943.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/69694713f766f5b4daa4ee0122c2aeb1/wuworumulidebunamatonup.pdfIn PDF document text
- http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/77035290934.pdfIn PDF document text
- https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/68d07caf38376985392abfdc399d4d7d/ripakitunilopaxuviwadagew.pdfIn PDF document text
- https://vico-domrep.com/ckfinder/userfiles/files/fabaxilivarufetol.pdfIn PDF document text
- http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea4fef5e8---41118893333.pdfIn PDF document text
- https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/eh36k45ehft4d0effdq0s18l4c/29358513198.pdfIn PDF document text
- http://school19-zav.ru/userfiles/file/fegibosuxaga.pdfIn PDF document text
- https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f182be1df0---20020802225.pdfIn PDF document text
- http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160827670eebdb---penusodijibajiruduzene.pdfIn PDF document text
- http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l0g29h52sgu7sefpai2cr59g74/44858342731.pdfIn PDF document text
- http://kodcomputers.ro/2664/uploads/6322508371.pdfIn PDF document text
- https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d542d0acdbeecff754ded8fd4b12ff1/zejumisalofi.pdfIn PDF document text
- https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/a244ba6426b0be28996b988f31d9d251/gamisujegiwiko.pdfIn PDF document text
- https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb41760596---kojelekasi.pdfIn PDF document text
- http://jvcc.cn/ckfinder/userfiles/files/210609195753549114evs99.pdfIn PDF document text
- https://aimara-bg.com/userfiles/file/japewobudidetepezixujifep.pdfIn PDF document text
- https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f5d560d2a---78125843673.pdfIn PDF document text
- https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a31e3dbd8---gebezo.pdfIn PDF document text
- http://bloomx.com/sites/all/sites/bloomx.com/files/15821314001.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_off0000ed31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED31	17288 bytes
SHA-256: `aee17b6b4de459206739b2b459f387bc8e295609d8df65ea7065271c47c1087a`
`font_01_sfnt_off00011ab6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AB6	10776 bytes
SHA-256: `262138bde193687d925e0bea6ffd4c3f7833ea07188c79804291fedc2f983f9d`
`font_02_sfnt_off00013360.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13360	16280 bytes
SHA-256: `1876f3d2c47017fdbdd4c02fd8cb2e9d16652a8008ef2d4f6ab41ab474841de4`
`font_03_sfnt_off00014962.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14962	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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