Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e466e7a04107c7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 06:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: d800021898588bb5bd81506a93f7968a SHA-1: 856d584a776df1f4c6f6fa6dba3eda283246ba44 SHA-256: 51e466e7a04107c7a52f2088301f22dc5e4f0c192223f6ec87430741cb79a404
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/1nfjbuf39i0u0c029l2v7d40a1/63437808948.pdf In PDF document text
    • https://preciseenergygroup.com/media/33761155152.pdfIn PDF document text
    • http://lawngo.net/fckfiles/18701220533.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/fereb.pdfIn PDF document text
    • https://stopserv.ru/files/file/nipogelivufalazanul.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077273bc917e---lezogurokewadixuwuloka.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/s75erqk1vjarcomkvvjtabsqsc/94083460586.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d00023b8e85856ce0f94f51d9335a578/vumuwujujivubuzeza.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210816_21AE23A0646AA4EE.pdfIn PDF document text
    • https://maturana.cl/upload/file/tebuwebadut.pdfIn PDF document text
    • https://carlojans.com/cms/file/78300938807.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/gubofarigatira.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rizupodeboxetuguzeroj.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/luxakufazixebe.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210525182755_u98i2m.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16075a4656ca18---49632134803.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160848c1e3b145---33246012627.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/wigawapopapaf.pdfIn PDF document text
    • https://europartner2.pl/uploads/71900973175.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/neremodoxakixebotukal.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/94195402401.pdfIn PDF document text
    • https://pindimana.in/uploads/file/27110992396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=journal+of+technology+and+science+education+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cb038e80eb6ee1ef6d8ceb281c725d9/6568497062.pdfIn PDF document text
    • 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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 18012 bytes
SHA-256: eee6d5563fb66301b25b14e3e575a2a0f647b88357a2c489efa0fe4ddd1eacfe
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 11104 bytes
SHA-256: 8388527c1a9327c290b36dc222738a20f1f8e81395835ccc232dfcceae19e561

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