PDF malware analysis — malicious · 83d22abb20e4e7a8

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 12:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 7d547ea6bf27a8f218dd3864f6b8b81a SHA-1: 5be50c97617bf7412a107b54c4702008dc04d2fb SHA-256: 83d22abb20e4e7a81a474724f674316c8608505c7a1f2908d74da655703ad8fe

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests it's designed to lure users to external, potentially malicious, sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

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 http://www.abcklima.hu/data/editorfile/jewezadedanekif.pdf In PDF document text
- https://mytekas.com/UserFiles/file/8035310441.pdfIn PDF document text
- http://pokemom2.com/uploads/files/malejivexojizud.pdfIn PDF document text
- https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8ae9d5726970a775b0eaed3467607e8e/55233105317.pdfIn PDF document text
- http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd5077f32fc49c310c34a6820b419f/68187342355.pdfIn PDF document text
- https://duext.com/wp-content/plugins/super-forms/uploads/php/files/29e67a3563736e7fce65203b51852cf4/33237311885.pdfIn PDF document text
- http://alnadaoil.com/userfiles/file/87758858539.pdfIn PDF document text
- http://domainecomps.com/documents/files/31529198569.pdfIn PDF document text
- http://dentalweek.eu/userfiles/files/86558296846.pdfIn PDF document text
- http://studiotecnicoforace.eu/userfiles/files/bajolisemalemutavix.pdfIn PDF document text
- http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a938b0fe0a64fa2767af9c9f4f8da4a3/sasusakovajum.pdfIn PDF document text
- http://usatovl.ru/upload/fckeditorfile/28680575123.pdfIn PDF document text
- http://i-harmonics.com/upload/files/94877245101.pdfIn PDF document text
- https://cepatdaftargroup2.com/contents/files/fepizamototanepajisavixow.pdfIn PDF document text
- https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/em4cr1semdmpa9uieok4jnlalr/gujigewibelenowipasekaj.pdfIn PDF document text
- https://locktactyuma.com/userfiles/file/83642104967.pdfIn PDF document text
- http://antansconstructions.com/ckfinder/userfiles/files/zavekometeda.pdfIn PDF document text
- https://noddy.nu/images/file/ziwibi.pdfIn PDF document text
- http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9cef364e8---17845580747.pdfIn PDF document text
- http://tdbakademi.org/userfiles/files/15652548937.pdfIn PDF document text
- https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a6e253acaeb1ea57dde861766579ed2d/22582300951.pdfIn PDF document text
- http://karcannakliyat.com/userfiles/file/lazorofomu.pdfIn PDF document text
- http://kleinschaden.expert/userfiles/file/15264409704.pdfIn PDF document text
- http://greenplanetnepal.com/userfiles/file/39277595847.pdfIn PDF document text
- http://hzjksj.com/images/upload/File/65710328656.pdfIn PDF document text
- http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sujubilituvudakuvedew.pdfIn PDF document text
- http://cp-tournament.org/ckfinder/userfiles/files/81623582415.pdfIn PDF document text
- https://momsgardenfoods.com/ckfinder/userfiles/files/61648376279.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=corn+and+cheese+breadPDF 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_off0000da83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA83	18416 bytes
SHA-256: `101d567d6b64bf6708d136363d79edcccb30be0878f9646fdae54313fa33d439`
`font_01_sfnt_off00010ad8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AD8	10400 bytes
SHA-256: `76725ce5822a54653464c399c618c6defcef79f3b9674ecab274447bca78a84c`
`font_02_sfnt_off00012251.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12251	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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