Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b8e4d1dca81af4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-14 23:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40a3ab01b20f57d1a23ecfcb50415b37 SHA-1: aa9cc698f0ddccd5f8392dc5f8c4f9134143564a SHA-256: f6b8e4d1dca81af4d3144da73307ba95b51f2f05b6e63da7f73eaa91c72c61d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 https://cructi.ru/uplcv?utm_term=the+dynasties+of+ancient+china PDF link annotation
    • http://antifftech.com/uploadfile/file///2021090723370292.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/89657856629.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/sewit.pdfIn PDF document text
    • http://saaretravel.ee/images/file/viruvamov.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/93843013961.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e85ad736---mazogomiboxowuwowaj.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/96171334180.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/59713338237.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a698d61db2---mugeniv.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/76829444653.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/8533564505.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e84e4d8c0---bozividin.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6a75209b2bce1499b00f2c3b3ed3d363/44005833753.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/83213313801.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/tubiwedezetitak.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/32128731620.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/tivekipunisojagekuba.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23445355030.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/viwubi.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/15444594561.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/45883369204.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f99a18687521612210cfbd8fed58ffe7/27050940392.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pokarigiju.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/tabasisavejika.pdfIn PDF document text
    • http://gysanya.com/upload/file/210909173758633722oscv25ozmrdb.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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 10504 bytes
SHA-256: 1d13b11c12da3612efe0b67d145fe7e25a23637562b27ba07d0fd11f9dcc9312
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17832 bytes
SHA-256: 708500e5bbfe10beb20fe015994bb777fe092e3046c434bd31e8bef179950f9d
font_02_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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