PDF malware analysis — malicious · d684c94832e96471

MALICIOUS

PDF

85.0 KB Created: 2021-08-25 00:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: e57f29ddc0eba82bdeba074d9694bbf4 SHA-1: ba072fb9c1c8d89728995a8fdc857ac3612ee62c SHA-256: d684c94832e964718ef7c32c35f4a7691b05142940bd146b5f28352a61341605

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to manipulate search results or distribute malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

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://archism.ru/uplcv?utm_term=electrical+engineering+materials+mcq+pdf PDF link annotation
- https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3c00257474c62a1d9a44ed9098f0a70c/parifupelelunoz.pdfIn PDF document text
- http://davidhammerstein.org/userfiles/file/15766509238.pdfIn PDF document text
- https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/aabbdsl16pihq13dv074epnnc1/kewidepubotufe.pdfIn PDF document text
- https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k9l9k28b3vpp4uane0l8ll3ee7/nogowederinajelelijovojo.pdfIn PDF document text
- https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6c8fdc6d7a53e440db7042ed2d771dff/fawevijonupovokekolo.pdfIn PDF document text
- https://sealordhotels.com/ckfinder/userfiles/files/58980685202.pdfIn PDF document text
- http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609777afd53d1---fimid.pdfIn PDF document text
- http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3832500382.pdfIn PDF document text
- http://dichvugiayphep.net/hinhanh_fckeditor/file/nisefokulesupax.pdfIn PDF document text
- https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8df2bb42ff70504af05df1ab565b14f7/77035876909.pdfIn PDF document text
- http://makeyourpartnermelt.com/userfiles/file/84607038493.pdfIn PDF document text
- https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074298a94ca1---10383095815.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c968c8915fd---64453736811.pdfIn PDF document text
- http://perksys.com/userfiles/file/ziwig.pdfIn PDF document text
- http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddf1a1f75---34889217078.pdfIn PDF document text
- http://mentaplywood.com/images_upload/files/97647314035.pdfIn PDF document text
- http://dbhsreunion.com/clients/21010/File/rozuralitodur.pdfIn PDF document text
- http://tylerdaynursery.org/clients/8/8e/8ed7c4ff1d995b028c1180c1bccb3f4a/File/wadawitikax.pdfIn PDF document text
- http://brianhaymore.com/images/e/file/nazuzudazazanun.pdfIn PDF document text
- https://diedacorporation.net/freesiafiles/file/1185508017.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/0f03bde70a7da56bf727fcee98bc3694/65613079861.pdfIn PDF document text
- http://littlepearlbooks.in/data/eimages/file/rogiduje.pdfIn PDF document text
- http://silmalogistics.com/sitename/app/webroot/uploads/ckuploads/files/66072222288.pdfIn PDF document text
- https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083735c1d7c4---mixuvomenujifutininosifi.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b884edc68---7837434745.pdfIn PDF document text
- http://classicalgardenornaments.com/uplds/file/vubizufoxisupuxopuso.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e62c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE62C	17188 bytes
SHA-256: `d7e196696350f875bc28969c6cfbf49939227a3ead7f9852c0d07bb538419b2e`
`font_01_sfnt_off0001133d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1133D	10972 bytes
SHA-256: `d1e8aa1acac3f407f60bdd560ac68bbff41aa6e2e93ef4e4ee76958e5c7cc47d`
`font_02_sfnt_off00012c1b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C1B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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