Malicious PDF — malware analysis report

Static analysis result for SHA-256 a628a22c9524cbdd…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 06:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4af1c13ba2637ddfdcf4bb5c1a6f44f3 SHA-1: 6102e720a8bf7bbe9aeaad1df9ef1ceb1eaf7abb SHA-256: a628a22c9524cbdd6ecb6734cd58372064b4ecdaac4831e8f6f744dbff1185a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/00c617641a8245ada19772af01fce08a/5399404647.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/301444b2b1de978886d2e79d1a9f9cdc/gobejufexozizem.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf976689ac---74808596601.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/c399d752d2a7ed9025c995a2350ce7fd/99495614156.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/menarizuwol.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/zapabapoji.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/sibaxiweperefuxa.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/wewuwikaken.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/da5vgsihpu7sai6e735rvgqdqm/83861444859.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/g576dkf9odbbaim63rd3o98kqf/xilezobe.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3c7e94701bffa713d32599d9c947c70f/fiwamagivatesobizo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/231a4ac5de312deed55aaa96f7c0d4cb/12665981818.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a3eccd14724637bacca162d2b0e28f1a/lewowikuwududir.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a422c1d8fe9---21479217875.pdfIn PDF document text
    • http://cartopack.com/Images/file/10049811203.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210606120338.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c2605ab34ebda36b7c1adf2fb036155e/lerinasukagelikoto.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d8de2e21---42619468566.pdfIn PDF document text
    • http://idroter.org/userfiles/files/78691637195.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3c3b3972c0d00e1bf71623b3a0e573c0/89342807060.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a058a35c27b---zifitunufosak.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/ligew.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jojufiwaxezekogede.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/7c79320cfd8e0a08d89007c1c977a740/tiluzu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608087d1a1a25---witugudidenigotub.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/14301325907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+wallpaper+androidPDF 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_off0000c31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB32 10524 bytes
SHA-256: 2a09e26480d446bd2c35e5621f5bcc1dbb32a18c1d5051b2282ef3fb517e6903
font_02_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 16300 bytes
SHA-256: e08b2063ac4ee369e5446103a88f0f103b71ce3116eb2e226d5f5926bd715e67

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