Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d8770658d3e47…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 14:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 64cb051a78d635c732005b5b38812e07 SHA-1: 2fb821ca4daf9b758b3c5019a38b57d9884cff4b SHA-256: d73d8770658d3e47c77c99dd3f1253af8c36720d13d0647613e22a6b969d0936
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple external URIs, including those pointing to compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users. ClamAV detection and ML classification further support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://onlinecommerce.bg/uploads/pages/files/99336304133.pdf In PDF document text
    • https://sbmhavacilik.com/userfiles/file/rubosewuti.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/bizomokimezaseta.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/39552230730.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/71475829223.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nimoti.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/rozesedevelofaralota.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/57654282131.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/86484398713.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/xajev.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021153358169.pdfIn PDF document text
    • http://synphabase.ch/upload/file/bijolovenoluwatilojif.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0905d28c51c8be9dee9f709ceebe2f13/98472263594.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kupupaxidifugomame.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161327d15f3943---79973154849.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6a30b6db3---welurotegupevopodil.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/guronezupenofapodipu.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/17253149353.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/sefikitaje.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa0c93181---81748010576.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/28807321994.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/kuzixakezivijejap.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/manudijexi.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-9/20210909110142571842.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97422073449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=photo+sherlock+apkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/98893000445.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC684 18592 bytes
SHA-256: d414235b02f59796ffd03b980fba65c8afcc05c67c7cd46630f802aaf7e901f1
font_01_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 10368 bytes
SHA-256: ceb39322b570e4ff1d4f727aaf7b343b53cd8022cc2b3de90f313a05982f01d6

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