Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ae5fc61794ad09…

MALICIOUS

PDF

72.9 KB Created: 2021-09-06 14:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3f4423c7126adb4d0b0d87084de758d SHA-1: 53a63b974a87b19bd62ec44b3e39ccb6a5f65ea0 SHA-256: 66ae5fc61794ad099d87f84872f3587066fb851b21d9067be510b52c5f495e95
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs that point to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of these links strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/6bff4fefde5142fa9bc39e4f878452e6/rituzed.pdf In PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb94d61ea---95954949385.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae916f3a689---leduf.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kenedanaj.pdfIn PDF document text
    • https://senfina.top/uploads/files/gasegidixop.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/wemizazuvazisi.pdfIn PDF document text
    • http://indecomavo.pl/inc/47517483596.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b621069626---7536540187.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/83140632158.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/63eda37d74fd2a5f72b492b32a8c1375/15428581838.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/65213536976.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607aca7370405---tatopirimiginod.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210625_EADB5478FB503525.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/67667190509.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbd9c34d9---vopaweti.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/26716608535.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/virurizewolagudapasuzek.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/10362098854.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/78474518282.pdfIn PDF document text
    • https://netlandschool.cl/files/64335323937.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984fcfb32dc---14447761415.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/vipufuz.pdfIn PDF document text
    • https://anakmeong.com/contents//files/67173681186.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/bitido.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/sr77t9bkdttda3089a5d6umrf5/giberobena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=body+ecology+diet+pdf+free+downloadPDF 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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 15836 bytes
SHA-256: a14f5f676b34e6af39ae27a7a082ec7440da31172d996a1fb9d5c20ba6400293
font_01_sfnt_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10880 bytes
SHA-256: 8116274ef8e7c45eab5afb213a8dea7904222ccfa19e4de37d7d2d35d57f3997