Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded58fd7d955c7f2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07ac3cd1f71a48cdb6dd04ff090849e9 SHA-1: 70e03ded1d1aadf6980a88fe6b75601727572c36 SHA-256: ded58fd7d955c7f24c3d3300c1fd1cfc7fbf583ea0b1c60429d05a0f33beb5c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to facilitate further malicious activity.

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 https://5uempat.com/contents/files/movedi.pdf In PDF document text
    • http://lasermedia.cn/userfiles/file/98509557739.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/luminasetapunabofomub.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/kuzalefimibijukaf.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2c57765dc2a021c46cd66cc6cd12ddc6/75773741581.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/mogiwabubexobi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130340940e80---luwideworebo.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juwegoselisevetiwanofar.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/nedag.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/65047918845.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/puguzutew.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86327876410.pdfIn PDF document text
    • http://ropesadventure.com/d/files/bamezazegapijonan.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/391050291.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/45590935583.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/9205858251.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f8ea0d2f---52624253435.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/xafilikubumunizikunal.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/zitomizerisizese.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/pomesuvaxi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/zobobidalaxixetolukix.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/99717040836.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f148d0ba8---zudukovubelimowubu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/bozudokejox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+power+on+without+power+buttonPDF 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 10420 bytes
SHA-256: c0338c3518b9c886f240efa9e0a523e4e2b00a7090ebbe0bd22ddf4e2a6408b4
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 18056 bytes
SHA-256: 6e0d82e5b0e45572b0c9e0def031c06cfc4ebdf04b2607bd262fb4d43a65f338

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