Malicious PDF — malware analysis report

Static analysis result for SHA-256 39444eba74733b42…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 12:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bc855d7e16017e5f750262c1fd3bf3f SHA-1: 4db549983de2a222b42441f5ae4899043a13c9fc SHA-256: 39444eba74733b42b20fa28343ba5c812bb700f602e086597d04cd2bba1184f7
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 WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://angelojrobles.com/admin_initial_test/userfiles/file/67844183784.pdf In PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/wagaporofilixi.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/deluvuvufux.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/sovoxugibijararekop.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f1161c4a6---belivibox.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/wupopomolirizuwenalerawit.pdfIn PDF document text
    • http://retailcop.ca/files/lunewakiza.pdfIn PDF document text
    • https://tsolisp.com/files/file/16706440898.pdfIn PDF document text
    • https://protum.se/file/97245973589.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tazija.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f8bbc0ea34033014da67ef1fb8bd74fd/diworakunupilexebubape.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/63308353013.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/89353141914.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307497d0d89---vanet.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/likize.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/96877727182.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gezanagukapupedono.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/f85dbobo83b9rlr3fv13st14b4/sibetoxopeteporalol.pdfIn PDF document text
    • https://heyratacademy.ir/file/sobodovevuferovubiwupifa.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/26910282041.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/8553345049.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/18543546777.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/67096801773.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/javigolesuwa.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/runakovafobuzelavofovom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rules+of+survival+vip+cheatPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10684 bytes
SHA-256: 861c773b285d283781967d5c6ed67b0c6d5de66516b32e41da9dbb67fc7ea06c
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 18472 bytes
SHA-256: ae11c694d1ffe1c9f9d58ac6fa5cb8b66911d4a9356aa97c7e94743dcb78a2a3
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1