Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a1683c0c8386e3…

MALICIOUS

PDF

95.9 KB Created: 2021-06-20 17:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 62ba53695f7d12c283d9b19ff6a9d5fd SHA-1: 99ae7f36201ca0f4644998c131bd1744bb67310b SHA-256: 91a1683c0c8386e32efe03742dd68c26659daca3b8e46a87f2ba2b43ca170bff
176 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the structure of the PDF suggest a social engineering tactic to deliver a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://sportgalaktik.sk/userfiles/file/tiwopawaj.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/58aogv1i2l43r3tduh06p6ujdr/xaxivamefoxusaso.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5b713f7c---4500899348.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/317734a9069a3c4ddafed4f92dac98a6/tuvopuboxibar.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sutepovipirejozoxaxetebo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607005c48a8e5---zonanavefufuvazavamumutep.pdfPDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f05f3036---lojokerufosob.pdfIn PDF document text
    • http://klefmarken.se/upload/file/baxokigedumexuzomumufizu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964da45793b---wezulopugowotiz.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/jekimito.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/97840712892.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9c34edf0---wirir.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882e1f88abe---13646892904.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071653ab00a2---97941636764.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/c690e7e929e01257c6d6ef779b598744/gazagagevipolisorurodajep.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/vulolugaba.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/weguzimifudenadivirufavax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=insta+story+video+saverPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 4888 bytes
SHA-256: b96152015dffb50c45ab351ac778924f20b57e11bc6b504e0da2ccafebbe7cac
font_02_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 2488 bytes
SHA-256: 5219dc88c03a604e7fd8535924384c30b6b25016914f499e25ddce79c6274b33
font_03_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 11376 bytes
SHA-256: d85ba6c75c0b84202dc4b7a93b7bbe8b9509686b48e855abc88a65935c311f07
font_04_sfnt_off00015c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 16148 bytes
SHA-256: 89d88174a6941e29d95412da3dc50f63e5666a45f2fca69c828f67d7ba3b84f3

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