Malicious PDF — malware analysis report

Static analysis result for SHA-256 92bb420b8417630b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 20:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12d842f90e088b21d2000c54d8ba2e94 SHA-1: 7764c9dc55f54ab45bde94d3185ca2218deaf962 SHA-256: 92bb420b8417630b049814f13e2038886b76d30c31bb54ce5c282b062c3cc386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kbautotech.com/board/datafiles/imagefile/79767963633.pdf In PDF document text
    • http://tsutae-f.com/js/upload/files/jesus.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/8489713390.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16141267b0b7a0---tarevonaketurikubixuxet.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kopikawufu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142207491992---mazipamitubarifeme.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/85025957300.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/51566268758.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/lulotiw.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/41727987694.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/1490453128.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/3450093030.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/2709366743.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/91221427910.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/49509300602.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xonulivowunise.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/pegejizusugadexulitisuj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/17bbd82029c20aa8b0f7c10dab5de512/tebigase.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/muwumokigadatobosuras.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/36311942512.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/lirinerodikokabuv.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/woxosoworafen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=iceboy+and+lavagirlPDF 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_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 17756 bytes
SHA-256: 666f5a66a41f4d44ed1753cc4db83824ffda8496add21c014304986ddfc64f9a
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 10552 bytes
SHA-256: 9ee7ffc1acb24217be3f2a99e860cf33c31fdf156ea539866e137b7396110836