Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ccdd6fff433f63…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 22:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7fed93e0a788403b2d1e75062e4f81d SHA-1: 0379260d3f33d3a960060769b75f12de0cfb95d5 SHA-256: 18ccdd6fff433f638c90506f797aa1e57be89a7ac8e63f980c67e0277acd314f
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification, likely involving phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.1482

Heuristics 6

  • 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
  • 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.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/365fbb310aa3ae116fecee239edafd79/zujowasigowekeg.pdf In PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/29191050403.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb89b7a6169---webopikifim.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eec15add0---torinenuzub.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/kirevomav.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/todanox.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/400423979.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/pirajafinovol.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6bcea5c138adb9b2e4ef9b1446708546/sudovolim.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/53219986966.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/potigejotasevosabodoz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5133b84bb---juwalukajotorodimifenavub.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/b9bf3ad0e5ba39f6cd2987c74da830df/79758321092.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/dasunisud.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/juvaloro.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6ec8d638b5eacaf2a12cfbbf00024161/vajirewamole.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e225d26b77bed7bed574d71c4a1d449/91321236806.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/49604373823.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bs8tb8hl0donmt77nali4u92ao/dosigupitinod.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/87479176639.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/gupumixa.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/42026847739.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/romibiner.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e7a9bd14af3eef85156fffc16933eda7/61016971424.pdfIn PDF document text
    • https://biomisszio.hu/tmp/pemilolitumetelijafex.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d964bec44---99773540082.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/48068465795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chapter+5+exploratory+research+design+qualitative+research+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 18676 bytes
SHA-256: 18829af41202c5d6cc476bf7ec84c77b86cc60aff7eac10c14e0013e8c5c42f7
font_01_sfnt_off00013715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13715 11592 bytes
SHA-256: 71406bbdf134f785073adb6f4bdac82dfceee52069423b313ae700949db99cbc