Malicious PDF — malware analysis report

Static analysis result for SHA-256 2191516b6be42b22…

MALICIOUS

PDF

93.1 KB Created: 2021-07-08 15:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c252ad737ec1edc839d0c3043d250865 SHA-1: a0c8602e0370fadc320f944dd52dc2aadf651552 SHA-256: 2191516b6be42b2243628b5b9902e43d0008655bcd2c1cd422c70651c5046cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised infrastructure. The embedded URLs, such as http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/511607545b3278c3ed5dbe6e5afe4ec1/turifujenetokezuzafin.pdf, are the primary mechanism for this attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/511607545b3278c3ed5dbe6e5afe4ec1/turifujenetokezuzafin.pdf In PDF document text
    • http://airelimpio.mx/img/editor/file/zowusakejutofeb.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/71268195748.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fogisa.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb4bf093d---48787946516.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bdf37b9fc8034641f809da0a40348940/kuruvevo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8f323e1aa0f8f34ac3b03cac97783b48/62384053346.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/11495104636.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/24475363606.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-27/20210627041319130897.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/11661bd3bf297624cbf49b1e281486e3/62100545326.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2f8583bc3---23569449080.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ebe1aacb4534657f5373551c689c06f8/zunomikivirufapawasubapo.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/47663622293.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/zamut.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wusivipemexuvariwugetul.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wewaxefefirelemobagoz.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089c5612956f---winopixa.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/77598187849.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/73755404777.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/ccfe5e69e067ed8d8042061abe92e11f/zekasoralur.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/jutefabadujixegamurewuv.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/wobazes.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/12cabfd42e33b50d9ae43285f3569d2d/kepuxavisuwapexajixaxaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+more+gems+clash+of+clansPDF 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_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 18748 bytes
SHA-256: 284e905ef599f760076a6a0716df307c1fd512e7f00a23c773a794eff665a7ab
font_01_sfnt_off00013613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2A 10768 bytes
SHA-256: c3d35cb5d3899266a1907e0bf3f193117345ead9436dba39d85e7a76a1a9ad69