Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa97b06d723c7048…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db7431b1af3a160657fec2536a90a58a SHA-1: 17f2748cba78200b094e93595fe3ffd59be9b1d7 SHA-256: aa97b06d723c704813a3dbb88f757c031cd7bb943be31a6d2f14b9651d019ff7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a malicious browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised or disposable hosting sites suggests a phishing or malware distribution attempt, likely leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://htbestcomputer.com/media/ftp/file/76125891862.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1610437d0b80ca---lefazetotafubo.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/rugeme.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36b955762---6200928241.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-13/20210713081034255208.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/37ef147fa49d96e9311827747e744007/1301205107.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2ef026ececfeb3b93ecabb38c312ece/64343473690.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/67787251756.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/219437d776fdfeedb5067a2d9482f657/77791553931.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gixorevid.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/80899736749.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ece6cdd32513c0eb9b78e00d9e298bd0/83121099703.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/95146583664.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/zenipumirugeje.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/2814212768.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4s6df8bdvrceqo005umvm4t6g3/13089891148.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607a895f84f69---56238730751.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/baluwujexaxirufez.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/afvuqsaahh1enbf5ui74770ct0/79383341310.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/18543546777.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b4c5e5bc---fobax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+merge+two+pdf+files+into+one+adobe+readerPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/vabolapatuvileb.pdfIn PDF document text
    • 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 17720 bytes
SHA-256: 6153404f76087cf158ec96a8f969a7870e11b097cbfd6218d3310917debe2414
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 11056 bytes
SHA-256: 49d5ea86d9bf41d615c2bccd0fdd721dacae66c9c1fce9b41ad1eb185aa5b6a8

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