PDF malware analysis — malicious · 7cb4a28ef33d2cc2

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 01:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 5d5696366d3d750e8733a144a5886f7d SHA-1: f99ff098eff66ddef1f5f162bad415b6e8098119 SHA-256: 7cb4a28ef33d2cc28444a445ceb36fa98da5a805ff8230284e9d3e7c5229af1e

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The embedded URLs, despite some being marked benign, are part of a pattern to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de950e19b---35759738708.pdf In PDF document text
- http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd1093477e---11537535014.pdfIn PDF document text
- http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607956e8d7e5b---61152466053.pdfIn PDF document text
- https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160748267d6483---fuluboruvez.pdfIn PDF document text
- http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/16121740918.pdfIn PDF document text
- https://keluargamimpi2.com/contents//files/87006292354.pdfIn PDF document text
- https://monyetmesum.com/contents/files/38931730004.pdfIn PDF document text
- https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/027b044932810ac2181cf98aaabf5dc3/nuguj.pdfIn PDF document text
- http://khocabien.com/uploads/files/sipafateratez.pdfIn PDF document text
- https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/609ee30307ec3b9a1e36bb79e9e44842/32783480268.pdfIn PDF document text
- https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qhjce0phduqj78sfaphphb4s92/wazezifelip.pdfIn PDF document text
- https://www.nevjegykiraly.hu/userfiles/files/36135548507.pdfIn PDF document text
- http://zuche0551.com/upload/file/mawipe.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/107aeabbe2de7347970cdd5ce6f660a9/xapaxokakemarelusurib.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0fc147f3c0a694c93bd230d1f4063037/86077270769.pdfIn PDF document text
- http://vogiantinhmach.com/media/ftp/file/puzofuduledajuzule.pdfIn PDF document text
- https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0af5742b5---33938354550.pdfIn PDF document text
- https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103bc9b0fdb8---73048706891.pdfIn PDF document text
- http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wotilimarijibaxozeved.pdfIn PDF document text
- https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e4eb9f3e---wewoludati.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1a768417c---pexejadodite.pdfIn PDF document text
- http://ufcnagykanizsa.hu/userfiles/file/37646273571.pdfIn PDF document text
- http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4e932945---42240652278.pdfIn PDF document text
- http://www.yevres.fr/ckfinder/userfiles/files/64134417829.pdfIn PDF document text
- http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2eb635441---girupogevigepibabumemit.pdfIn PDF document text
- http://cdhsalumni.com/clients/28864/File/29347280678.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=regular+verbs+lesson+plan+pdfPDF 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_off0000d479.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD479	10832 bytes
SHA-256: `bafd08356fc90a787cdc6f772d7d420b565a1bcbed0604b37aa8ed850ee53a1c`
`font_01_sfnt_off0000ed35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED35	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010547.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10547	16980 bytes
SHA-256: `fde5d66119aa5b82b7327676dbcea641f91b6623f00ec20a22f66875c51a89b2`

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