PDF malware analysis — malicious · cec9bc02738fc345

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 19:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d0ddaa4a9b4ba8a18ff0e9f24e3ab32a SHA-1: 04c4d2497070c2c90f46f7f744cbe569b1323643 SHA-256: cec9bc02738fc3451f2df8ceaa20ce79c829a9ff58e25256222edde4a6720037

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=pubg+apk+install PDF link annotation
- http://sunmoon-glory.com/web/upload/files/54804984618.pdfIn PDF document text
- http://doks-films.com/pcms/content/file/muwarirefitegevolasenal.pdfIn PDF document text
- http://sualpturizm.com/userfiles/file/lidew.pdfIn PDF document text
- http://cartopack.be/Images/file/gubuvuzefizugotokixox.pdfIn PDF document text
- http://irollee.com/userfiles/file/xipunojinasupesatik.pdfIn PDF document text
- http://ysenb.kr/board/file/editor/file/26297911907.pdfIn PDF document text
- https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134138e202fd---82336089618.pdfIn PDF document text
- https://xo-sound.ru/userfiles/file/kobamakeduviboturak.pdfIn PDF document text
- http://bukharajohnscreek.com/sites/default/files/file/58187478447.pdfIn PDF document text
- http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gopiwedenazobefes.pdfIn PDF document text
- http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161354e5e78455---zozubudefoxa.pdfIn PDF document text
- http://hotelbasantresidency.com/uploads/93382587802.pdfIn PDF document text
- http://police8coop.com/UserFiles/file/6625793052.pdfIn PDF document text
- http://deeringbayrealestate.com/userfiles/files/83172859943.pdfIn PDF document text
- http://graphicyazd.com/ckfinder/userfiles/files/38784567098.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f5f497f14---38877121826.pdfIn PDF document text
- https://chezgregoire.fr/userfiles/31728378891.pdfIn PDF document text
- http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/8847451684.pdfIn PDF document text
- http://vdtonline.vn/static/uploads/editor/files/6562133712.pdfIn PDF document text
- https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/uou947bfblmsih8mosmiqp8uln/gofaro.pdfIn PDF document text
- https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/kdvii9ehvbljb4vu74sinbroj1/xogizinelujotiva.pdfIn PDF document text
- http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zumoluxadebazaropemunomeb.pdfIn PDF document text
- https://auditorescr.com/ckfinder/userfiles/files/duterosafiwaloxaf.pdfIn PDF document text
- http://kaies.net/upfiles/210903052109712610vp3jgj.pdfIn PDF document text
- https://propiedades.net/ckfinder/userfiles/files/roxakadajovabibuzedapo.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_off0000b874.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB874	16224 bytes
SHA-256: `658ecc73562539f2d0db04bc847fbadbb19d3b888b2f1db1feba17ac7bef5002`
`font_01_sfnt_off0000e1cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1CC	10408 bytes
SHA-256: `f2e6e61941d8932c17a83940ce68cc4218ca6e0e069a91b745828e68ecffc04c`
`font_02_sfnt_off0000f93a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF93A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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