Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead936de69d9a363…

MALICIOUS

PDF

82.3 KB Created: 2021-09-02 04:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ec7f41f867419c4494a9e573dcf21de SHA-1: 5b12360e87f4f8041a518602a0a3b22e54547a04 SHA-256: ead936de69d9a3631f46dd78601ea904d4831c42c73e45fb7aef132881e7a963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to potentially compromised websites or disposable hosting, characteristic of a link farm used for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sambelteri.com/contents//files/puwumufigusesakat.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fa1b8f7a0---ximet.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2341d00ebd---babidekokileriwiwodeb.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/65764152987.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/6288239151.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/74737617275.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/6155446045.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/wizix.pdfIn PDF document text
    • http://uchid.com/uploads/file/nusigupeda.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/85670304114.pdfIn PDF document text
    • http://d-innovation.com/upload/files/28487358368.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kavutifex.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160750fafb91c3---donajumasudululunekom.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/53471415743.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/dojawutirogivolez.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607513955c6f8---nuxajewetomimegepipovot.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/15476254248.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a42ccf8f91b208d1584f37379f5603df/gowakan.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7dd7dbc0a---pukijovumi.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755a89b5f90---65504622735.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/reluf.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/41925121765.pdfIn PDF document text
    • http://askort.pl/Upload/file/64142399462.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608156d9838c9---lovizozalerimajebufegakir.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35657588327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+braille+system+reading+answersPDF 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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 17548 bytes
SHA-256: 6c5ecb2c16bd082e817f959ddcd6302dc28a167a2d2a4d7cd8d90886e03bca22
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10880 bytes
SHA-256: 0d12fd9ffac9a4f4f83a4b10673418bda24a3cf1a03ad0a7534d68ae4aff8ee0
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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