Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd73d57b415ef6a4…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 01:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12653cf787d3607c9a714505ba518205 SHA-1: 40371cf7f5e0a492845f04facedc437b348d48a9 SHA-256: fd73d57b415ef6a4a9934932dcd6743da60d07f60853ca1ed709b72fc93e878a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, presenting numerous URLs that point to other PDF files, many hosted on compromised or disposable domains. This pattern is commonly used to distribute malware or conduct phishing campaigns by obscuring the true destination and evading initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://htwy.com/upload/file/fojafawekawutamumasuvu.pdf In PDF document text
    • http://xn--e42bt3l.net/upfile/files/kidikuxukudevire.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f16cef3a19f---terabevajirumivigof.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c001bb3fd651bda92a9c748088118e64/nowewuradodolojita.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kefixaninusonipofopugolav.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/85070972655.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/43360334538.pdfIn PDF document text
    • https://davaocarrental.com/images/file/serifibogimepifodanux.pdfIn PDF document text
    • http://rotang.net/userfiles/file/wojipuvuvutomojeb.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f728f687b4---vajirizijed.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4f96e5486---temimemot.pdfIn PDF document text
    • http://househouse.it/userfiles/files/76245823900.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/ranunabejemanatufuvozoj.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/30272138558.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/suzojitu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eacc1e3b6---72776521454.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/af31653f90690e16725014895ae180b5/96340384368.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1503cc2d74d811bdd398373fa3062cb/zosun.pdfIn PDF document text
    • http://trieuduong.com/images/Download/didagu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160798725240c9---vuzunowosinimadebo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a1042f993---dulasiga.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e764170a8064db71f9ee4f6f535d4b10/36582980213.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/zodolibin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=sewergems+training+pdfPDF 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_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10836 bytes
SHA-256: 3d3d1fe4d546113c64986a67361f03a3ab4283a7f74a2d00afc432817eab30bd
font_01_sfnt_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 18196 bytes
SHA-256: 50c615dd9e8564acf8e699eaac9c8d72daf705b9139ca23296473dde27e67d62

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