Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa277e2f85f5aaa8…

MALICIOUS

PDF

85.4 KB Created: 2021-07-06 22:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 726f75abadabac0e48f8b06acfdb7ba8 SHA-1: 67e1e0ee49dee5e1ec25e6b254220fb724aa728f SHA-256: fa277e2f85f5aaa83422b50df72157c32a7aabb38cd5b6dd5676f66938b91538
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of external URIs and link farm heuristics strongly suggests a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bbq88vfvsghukvp33hef5bmhe4/91625362359.pdf In PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d6bb041495208db4790fac8831fc3f7d/63865848441.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c927ee56cc90c29187b4ec6ca94111df/wosedivumaruzemedirajuz.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/27148587748.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/07651b0f7324af018d902d8c0df1a4f1/50804331051.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sudapu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/88213527075.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1ifoarol1piq6479713rav3dj6/zidase.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f87e9b9fc8547b16d19fd4431df76a33/93567943444.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/77474999408.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/8171639951.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a8e465d2f1a288f7019e26b2c7e67203/nixogupusamulifajex.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/17524089800.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/95n8p7j2nftbhq2i61hi957aa3/13924458263.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/ffd5fb88c2f8878bd85f6aa5d45f4300/wanuramik.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/97921756768.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3552e1491b---jupodurewobabi.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d1af24cdb---94881925342.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160890b26924ee---tiforadejawimede.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipineselediruweduwapim.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/b2c719887e1e3e34a571fd5ca71b4804/67781150150.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/tetifokezisuliko.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vifofutabojuj.pdfIn PDF document text
    • http://cctsjwhs.com/clients/0/08/08395bc9c2b8280888f0dabd04457394/File/zerevimabat.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4bfd67230d63644d4551c664e64cd346/lilawexulix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+remove+a+curse+of+binding+itemPDF 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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 17308 bytes
SHA-256: a47a3b230a6f9085980798c64a20df3f05e980cb4298819185af1e1f8d3707b9
font_02_sfnt_off00012e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E68 11156 bytes
SHA-256: e29f88a21d4fa068aabbb4499584812ae9b023f6a9cd39c90eb4c6ad1a4fded8