Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bbc626cefd37ae…

MALICIOUS

PDF

70.6 KB Created: 2021-09-09 02:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 999d7a1b5ac1ea9e47856705930d1542 SHA-1: 8ff9f3f25942d1789386beb89e653cb83d4715b6 SHA-256: 37bbc626cefd37ae3dc663117b57ff2949558a331bd05aefded42a03a542e786
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised WordPress sites and disposable hosting, suggesting it functions as a downloader or phishing lure. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.xzass.org/ckfinder/userfiles/files/22011637903.pdf In PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/kivovawakibig.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/rarosovidefifuti.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/xafiji.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/korep.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/14749323129.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/99665226947.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/luwoxazinokitiw.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/sozefalitosixesug.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vizukevovuruvutewopemen.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/4686071189.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/73871767964.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/13480985003.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gomikofalafibak.pdfIn PDF document text
    • https://sitarasign.ir/data/file/xisegun.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/8293613155.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613942803ba9f---rebebazimu.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/46984628273.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vit0c5hc3dab12vjstord5mko4/89524552969.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/24523360260.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fulinadigikedekij.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f0e856664---53106536453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+9+data+connection+problemPDF 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 10860 bytes
SHA-256: f6a30f8e355685d8a966108acdca7e156220911a30974d0caaf1295ba5d2d725
font_02_sfnt_off0000e615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 15272 bytes
SHA-256: 713596f93c23c2edf855e5d118a2969dcaa39b69d136cfea5c3f26f213c9f1b8

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