PDF malware analysis — malicious · d05c51d2fc337950

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 20:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 22928077bd0bfcca8ed8dc5b7cbd4e33 SHA-1: 27041dc9f22d29770853e4e19c6f555b18ddeb0a SHA-256: d05c51d2fc337950fb2601705308f4fd6e3b39e787eea2c8b7bc723d0bbc5395

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/35652341570.pdf In PDF document text
- http://www.hausman.eu/images/wyswig_images/file/62187386267.pdfIn PDF document text
- http://www.ville-dammarie.com/ckfinder/userfiles/files/1471251642.pdfIn PDF document text
- http://bumsnab.ru/uploads/files/bibavid.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100b1094e2---ragimid.pdfIn PDF document text
- https://windsbs.biz/files/file/joruxuwazimumutaxejuve.pdfIn PDF document text
- https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/vevubiraten.pdfIn PDF document text
- https://geneolock.com/ckfinder/userfiles/files/falidizafozinapusefuxana.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/wukazi.pdfIn PDF document text
- http://upasamed.org/Content/uploads/files/fatubojupu.pdfIn PDF document text
- http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86dd3eaf0bf4ede3f1c746b68fc45584/lakawifuworezisoka.pdfIn PDF document text
- http://www.otevrenysklep.cz/ckfinder/userfiles/files/jipotar.pdfIn PDF document text
- http://www.lircai.com/web/inline/file/49164225991.pdfIn PDF document text
- https://homestayhoian.vn/uploads/image/files/saboduwanulogoxemex.pdfIn PDF document text
- https://gberwanda.com/gbe/useruploads/blogs/files/lujelabuxupaxopisuzogev.pdfIn PDF document text
- https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307bbb8e3d7---jirebe.pdfIn PDF document text
- https://hoakhanh.vn/uploads/image/files/79136606003.pdfIn PDF document text
- http://aktifimmo.lu/userfiles/files/47968271005.pdfIn PDF document text
- http://sromedical.com/file_media/file_image/file/mosixenesifijov.pdfIn PDF document text
- http://miskolciharsona.hu/pictures/file/68446989612.pdfIn PDF document text
- http://fecirturizm.com/resimler/files/42067852992.pdfIn PDF document text
- https://currenwatch.myhost360.cn/file/upload/files/09-09-20-58-27-39.pdfIn PDF document text
- http://szentdorottyapatika.hu/files/1996526005.pdfIn PDF document text
- https://habibitours.org/ckfinder/userfiles/files/582974827.pdfIn PDF document text
- https://serrechevalier-skifun.com/imagesfile/podevilibodox.pdfIn PDF document text
- http://schokobrunnen.com/idata/xudevelidamip.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+pdf+editor+for+android+tabletPDF 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_off0000ddc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC0	17652 bytes
SHA-256: `323aa5786ff98025c74e99a76d8e5255a38e7e40e63bb61091be6beb9eaa4bfd`
`font_01_sfnt_off00010b09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10B09	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012320.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12320	10684 bytes
SHA-256: `ebecf0a414cee781b256f47ed573ddfa8282834501fe905a616befbbf02ef07b`

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