PDF malware analysis — malicious · e17508ba5ea6363c

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 19:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 93a6bfe1a97c5af69aed6db4001d535a SHA-1: 8b2b4d588b8554eedec35624c01deaa20e7c6f70 SHA-256: e17508ba5ea6363cfdd6686538169133981021af04c2c241670f2d386d2aa305

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, and several of these URLs themselves point to other PDF files. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL distribution strongly suggest a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9849

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://dydlhx.com/upfiles/file///vavimiwosuvatu.pdf In PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607063b75a345---lawowozosu.pdfIn PDF document text
- http://evpltravel.com/xv_image/file/13794201896.pdfIn PDF document text
- http://detaycopymatbaa.com/userfiles/file/6071176851.pdfIn PDF document text
- https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160736f0450c2d---40791474110.pdfIn PDF document text
- https://area34.info/wp-content/plugins/super-forms/uploads/php/files/8mmrkbjdr8ou2k06fjs0j46547/60240147158.pdfIn PDF document text
- http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9cedb358bb494f30036772667f9b190b/86654604032.pdfIn PDF document text
- https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c4c2e53ce8fe527c2ea7f991f9bda20/89181559067.pdfIn PDF document text
- http://safarang.com/basefile/files/91018366297.pdfIn PDF document text
- https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/noh3ie494o4bquvc35ahfc8gdk/bepabubotunato.pdfIn PDF document text
- https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/54048470015.pdfIn PDF document text
- https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/19375641621.pdfIn PDF document text
- https://banghenails.com/upload/file/79614085117.pdfIn PDF document text
- https://pianotuningdarwin.com/userfiles/files/22362195978.pdfIn PDF document text
- https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b605cb38612---15781328535.pdfIn PDF document text
- http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ff35d0a87---menojifefivonid.pdfIn PDF document text
- https://digireg.cn/upload/84168097151.pdfIn PDF document text
- http://wuxihemei.com/ckfinder/userfiles/files/20210605_014448.pdfIn PDF document text
- http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/budim.pdfIn PDF document text
- https://reazfarah.com/ckfinder/userfiles/files/xexamu.pdfIn PDF document text
- http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/luziwozifi.pdfIn PDF document text
- http://gdbchurch.com/clients/43262/File/wosikelenabarewo.pdfIn PDF document text
- https://kuni.ro/app/webroot/files/userfiles/files/lugesemezepani.pdfIn PDF document text
- http://poetische-malerei.de/web/editor/files/54490594457.pdfIn PDF document text
- https://gkia.org/kingkong/userfiles/files/fisefix.pdfIn PDF document text
- http://erex.hu/upload/file/53687808663.pdfIn PDF document text
- http://bestbuyfromindia.com/userfiles/file/3302021233.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=division+problems+worksheets+for+grade+3PDF 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_off0000e164.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE164	18068 bytes
SHA-256: `c4bf57643b03a14ac896da07de5c2aba98e2ac88c73012462a9e3ad5089d5ea2`
`font_01_sfnt_off00011071.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11071	11500 bytes
SHA-256: `cd7d62567c69f253187a50a620b4e8243ddf1543492e4ea4782171c1af5cf479`
`font_02_sfnt_off00012b26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B26	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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