PDF malware analysis — malicious · 0a17f12bb7074c35

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 07:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 408fb38957039c993483b348ecbf0e24 SHA-1: 3d4c5ba1b81acd25921f9b4e28b411d19dff1e97 SHA-256: 0a17f12bb7074c353112e5ea5ef63dc7f97c7211bd793fc2cf68e6819ece608a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier strongly flagged this PDF as malicious, indicating it's likely part of a malicious link farm or SEO spam campaign. No scripts were extracted, but the structure and heuristics suggest the primary goal is redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

Heuristics 5

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://bezagsecurity.cz/userfiles/97560007218.pdf In PDF document text
- https://tranduongauto.com/app/webroot/files/images/pages/files/48207043154.pdfIn PDF document text
- https://hostmegasoft.com/calisma2/files/uploads/9911883527.pdfIn PDF document text
- http://alphabodysupplements.com/newerac2c/userfiles/file/8485501835.pdfIn PDF document text
- http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072807ad53f7---62121537961.pdfIn PDF document text
- https://muahohangnhat.com/app/webroot/uploads/files/warako.pdfIn PDF document text
- https://aldapa.eus/files/galeria/files/66939411219.pdfIn PDF document text
- http://daycamhoa.net/upload/UploadFiles/files/tavodu.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f59cde5a4b---widutitoxudufijiwanejam.pdfIn PDF document text
- https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c1994197b62ba8ab1e9eae09f673ec9b/88395113853.pdfIn PDF document text
- http://statewideroofservices.com/clients/b/b8/b825a24af54c157c196cf52173d75bf0/File/59401724017.pdfIn PDF document text
- http://omonetach.pl/foto/ilustracje/file/dokibisuwadujevori.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/derivodatogidodusatuj.pdfIn PDF document text
- http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e36b0b70a---wikosunutafuzutej.pdfIn PDF document text
- https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8591440d6---memesawixumax.pdfIn PDF document text
- http://armanetti.com/images/netinokowakavenasaleki.pdfIn PDF document text
- http://jdjcnc.com/upfolder/e/files/20210821223800.pdfIn PDF document text
- http://ebd.su/UFD/7623/files/57215868120.pdfIn PDF document text
- https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76d428d81---xetumigarekaguleponemo.pdfIn PDF document text
- https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610ddc6375e71---temebotab.pdfIn PDF document text
- https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9554ea4b0148c06cbf3d12e9539fd4ba/32344051853.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d825c2e87---3698526353.pdfIn PDF document text
- http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ce0a30c10---romonebezerosuvejivuva.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=private+septic+systemPDF 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_off0000ddf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDF0	10448 bytes
SHA-256: `7fd9a696cd916a2f6dafc8ed4cf66d7ee0a31c6665512a5ddeafb603fd0ea799`
`font_01_sfnt_off0000f5bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5BF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010dd1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DD1	17760 bytes
SHA-256: `98bf6a64f04f6c2da239b0e9f5bfc5436de35edecd43728c7e7fa94a6dbdba57`

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