Malicious PDF — malware analysis report

Static analysis result for SHA-256 183dfc89fa6005f6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 02:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4724f41a94c4b10a5212c1b8b940fbf3 SHA-1: 487ef36974d35b4e878365c7fefe2f71bad72ff4 SHA-256: 183dfc89fa6005f6f2418ed74478005361034966ff54d17eb2fe57e42c82654f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate it functions as a link farm on disposable hosting, with several URLs pointing to potentially compromised WordPress sites or other unknown domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ccshecea.org/upload/files/vivojuvomamerobuvolud.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/jufimanewododiga.pdfIn PDF document text
    • http://nanopena.cz/upload/file/fazivupimusexujipo.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/jokijemitovapuxokeko.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/38692337314.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78b37e08e---7542316993.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6696f3a2---fusugikuvuw.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/4762247136.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/wuposad.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/9034682771.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/96639368451.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1629063018.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210718_AED66FD6FECA3177.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed37180b0---fedetibamewomoramarukixo.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/mupimolupetigupesabu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210615161831.pdfIn PDF document text
    • http://farmina.ru/uploads/files/4284505885.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5bfee06de---gawupewotovejes.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/xevujexetudowubejuwodi.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/79533455881.pdfIn PDF document text
    • http://kaies.cn/upfiles/2108141045011758561yy9uc.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=linear+programming+pdf+indonesiaPDF 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

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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 18432 bytes
SHA-256: d7011229bdc8c1204a99e6c2b217722b400fbcb26dc8e5a1827d8b845087fa24
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10652 bytes
SHA-256: b37914ae1a49f916ace58d3d7efad62b4466994a6c75147393e29dd522c49975
font_02_sfnt_off00011c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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