PDF malware analysis — malicious · cd7f417bc21f9770

MALICIOUS

PDF

72.8 KB Created: 2021-10-04 00:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 731b967eba52a31da282ce41a479d803 SHA-1: 02367288cc9ffa1de407a8c501d41745aaf3a1b1 SHA-256: cd7f417bc21f97702206e9c64e08b3d0865d547e32a62b5794715687a0f7a07a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics indicate it's likely a downloader or redirector for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9915

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://drafthe.ru/uplcv?utm_term=see+running+processes+linux PDF link annotation
- https://apra.pl/files/file/18326140187.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613382dc0dc1d---7458032045.pdfIn PDF document text
- https://envirotechindia.net/admin/userfiles/file/sifikes.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615689cb41f61---jukudijonepodiniwonojuxa.pdfIn PDF document text
- http://szilasfood.hu/pic_upload/files/japogosid.pdfIn PDF document text
- http://szjwwj.com/userfiles/file///xufabifulif.pdfIn PDF document text
- http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/3740539240.pdfIn PDF document text
- https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556ea21e938---timanedetumagararijap.pdfIn PDF document text
- https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b50783c90532cfa14123d17c757b4066/jirugudunenufoduz.pdfIn PDF document text
- http://salonmysliwskirys.pl/userfiles/file/farotegub.pdfIn PDF document text
- https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/37c16ab130b1b66be9e1d069b5a73b9a/53719631588.pdfIn PDF document text
- https://anne-berger.de/sites/anne-berger.de/files/fkcfile/lusobetepedorijuzuxe.pdfIn PDF document text
- http://laskod.hu/userfiles/file/wenizutesokenulanepolor.pdfIn PDF document text
- https://1am130r6h1n1-k11a7.com/contents/files/8143847891.pdfIn PDF document text
- http://austria-ex.com/images/blog/file/62291825313.pdfIn PDF document text
- http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/ketoritenanirugotoj.pdfIn PDF document text
- http://agro-vostok.ru/userfiles/file/kabivinikipero.pdfIn PDF document text
- https://rrhh.fronteraliving.com/imagenes/contenidos/files/31750356691.pdfIn PDF document text
- http://dostavkaturov.ru/files/file/51749118182.pdfIn PDF document text
- http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
- https://www.cascatai.com.br/ckfinder/userfiles/files/zipovodutupolixokalodene.pdfIn PDF document text
- http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161378ada9a1d2---17495072235.pdfIn PDF document text
- http://ydyb.com/filespath/files/20210929024355.pdfIn PDF document text
- http://nessium.net/userfiles/file/25574699322.pdfIn PDF document text
- https://hunglivet.com/uploads/files/202109240754061061.pdfIn PDF document text
- https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bb8bcf7ffc9fcb1b00c83413225ec9dc/binemexujorarini.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_off0000b7cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB7CF	17736 bytes
SHA-256: `0db3b50285e646b0e9bda630c18cbcd8977bc8e039de2e6001d8ee731e225fe2`
`font_01_sfnt_off0000e4cd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4CD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000fce4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE4	10564 bytes
SHA-256: `4f448e7135913f7a3c43285864ad37b310038cf875d459dcc305b587dff8620b`

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