Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fff9e353ef53e9…

MALICIOUS

PDF

105.0 KB Created: 2021-09-01 05:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 52f4c26e8c2113e79dfae198c45e5ce5 SHA-1: f8ab005cc831357119365753549af392f4a92e55 SHA-256: 64fff9e353ef53e9136db9a95c7a8ff20e9182d741730674f51269bdaf7c142b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/09e935cc408249300e17fb1f73103370/65134276055.pdf In PDF document text
    • https://alakharia.com/public_html/userfiles/file/11274292407.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/55725406029.pdfIn PDF document text
    • http://15889163.com/ckupload/files/16538721771.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/15137744349.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add8410a7fd---morewamutuwelixanageto.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/84i4kq9bctkp1m7k15pijdemc7/dozabesapalar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba1772895---83705036613.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ohkbm21c3192p4grjqqcq41nl/xugiwevimokasegatifal.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/75452369718.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5710c6883---tozelo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/ce72cccda0f8715eee12d012f8bd1829/52858050079.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/m3ug7ldr7uk62086bopriie7qg/jufudumoziba.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1b681e5b---xegofepimawuguf.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/17395537834.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/46577058528.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/84f8e7ee52673dbf8084d347419a8304/69965961418.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/79779577954.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecba15d942---59032792559.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080b100bb05f---nunejev.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/tapafaligusuvijakezafa.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/raxemutodosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+square+root+of+2000PDF 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_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 20040 bytes
SHA-256: 0f2d10f1efcd5719d0a9ce29cd2267ad71243d2e6e2ddad5d7a4a6eb7d2fb22f
font_01_sfnt_off000164b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCC 10644 bytes
SHA-256: ab92df7489af013a1145c19e8e77b196d5c49982706b16f785a99571d91750f5

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