Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca00dc2affc40b9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 23:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 230915a3cca13f60cbedb8013cec8fac SHA-1: 05d721bbc8d519cf9d5e5a783ea3db7e1de5370d SHA-256: fca00dc2affc40b94fa08c41d93315a050a9aa3ec2019db621ea7949cdace71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf4e26fae3---dotokagekasososodewivig.pdf In PDF document text
    • https://medpressa.ru/files/file/defejami.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/7b7bab0c83024dc3cb343ce5f9b6394d/razezizofizez.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165ea865bd---83769860261.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/tewuwugalebavozaxir.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/nuredikoret.pdfIn PDF document text
    • http://sartor.ru/upload/files/sovosogavumerosuziji.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5ec05cdc4c9b5bacf356bf89cadf2e88/vibolaxezofobofu.pdfIn PDF document text
    • https://umartravel.com/files/puwegamupoditobanaxo.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8aa74afe9---78118385529.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zezopexilisubuvinewi.pdfIn PDF document text
    • https://alutat.com/data/file/88304346870.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/nubeja.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/suzej.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/89472319645.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/44383435934.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9262sifmf5p7vq6gtea32ge03q/kiwemakikegopetuf.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/84113823852.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/57499743389.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c40c514b---rukoviboxasoxokusafovok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108fc23bf450---befatad.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/merepovudopezanajifu.pdfIn PDF document text
    • http://scro.ru/pic/file/14254050966.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/fanikezogofida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=proform+6.5+treadmill+user+manualPDF 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 18060 bytes
SHA-256: a2f571bbdbf22250077896fd5e88c41790863547160df1ead34ab84c2b8b2b8a
font_01_sfnt_off00010a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A29 10984 bytes
SHA-256: 90644ad05a6fdd934523126e4fe7561cd5a3d248f859194c8bbb114985d00be8
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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