Malicious PDF — malware analysis report

Static analysis result for SHA-256 c681a377cbde5e06…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 01:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ee517114c8e5e78488eb2c524941db9 SHA-1: 8fc4f82662d76af7351819d9336f00f5579a5727 SHA-256: c681a377cbde5e06eb619fca49a2d69cd58e3d11809e94f65653f966cda629c9
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 compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external links, which are designed to host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7980

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607010eef3cd4---xilifekilezej.pdf In PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/08d79eafbc19ac3e82e3aaea02ae6725/posibapipos.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/43599472560.pdfIn PDF document text
    • http://sakem.org/userfiles/files/51867104399.pdfIn PDF document text
    • http://prestopc.it/upload/file/21462449114.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/xijojujegukomiw.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/bibuvalobozosalam.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dcad26ee75c---zijesokufupidejapet.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/vsd018l90opp6ckj4eg4tid1l1/tirikowubonisidibipun.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/28754485548.pdfIn PDF document text
    • http://koala-al.com/d/files/lupapuwafafudopopizukud.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/rofiguvifitusenuvofov.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/39790550593.pdfIn PDF document text
    • http://gchs1969.com/clients/867877/File/66555827213.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/navetubesulidilekofezap.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/83020688830.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16084168059561---gifogasiwolibi.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/77209587608.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9426097f1---72960751941.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/9257109067.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2bdaf345f48edf964346afef11e1a21c/pijukotoludiwovetovutug.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/58613396683.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/bebegekiburaseretedimobik.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/48637721437.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/91528983124.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/giluwuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=blessing+marriage+hallPDF link annotation
    • 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10388 bytes
SHA-256: a387fe0cd3585415f27787287e2dcbea76c13babb846d416092607d2f9eac596
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 17272 bytes
SHA-256: 46f5bbadb64c1542ebbbafa6b9e06505d296308fa340a249b9c8c1d3629e2b5e

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