Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acd61f04745b764…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 20:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 959ebfc90dc0eb2349be4dbaaa49feee SHA-1: 0671cbe67578538934729f87cc4dc8ab3324d422 SHA-256: 5acd61f04745b7645d5dcfb989bb573782a3818d72c84d368c41dec4e0059f57
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deeead5571e---winugigaxadogudivemobo.pdf In PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/13937012196.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/93076811658.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607889cc94f14---71559593661.pdfIn PDF document text
    • http://dobski.pl/userfiles/file/41832374392.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161294efd87430---57380823086.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/zorotunivel.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a088eb74805---71536964632.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a55b8b8cb---nipowikuba.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16105b0de617e0---166578331.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3936080995.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607791f4816ea---dudomogemibifobu.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/23352579720.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bewalexavukepo.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/82237224544.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gexaponutosagufaxazis.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/88954363033.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8220_20210717142415.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d599eea4cf---labitujitejufut.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kujorefegogemurutijo.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/68583016415.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/af99d09a7231f79aa6b05c855c8ae3bd/24725269064.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/5ae50ce18907d19e48c79067abb5e335/xapumovugorisetifatojapo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b564eb353b---wovatutuloguxuwozilaki.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070514561773499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=basics+architectural+design+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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 17900 bytes
SHA-256: 0c5c7de9d6733880fde76f062f90a85b8133e893f0f07bf26275b48a8172613e
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 10932 bytes
SHA-256: 4721acf55e344abd077584ee520de124395171942c7e1a1f14e93210278e489c
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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