Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b037bc10279e11…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 05:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8ee0c7c4213e66fd17d1b718b2466ed7 SHA-1: ba34eebadc5b3f73e8758c0d3e47d0766a3659d0 SHA-256: 67b037bc10279e11a4d3d4e7846d8ed0ff460ccdaeef52a76d1161e7d8650942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The primary purpose appears to be to facilitate phishing or distribute further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=physioex+9.0+exercise+8 PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a909527c7634a697b60c4264dc645908/doguxurewawawomuse.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/gomerukolepamobivapope.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ee9ee57---pabaxevugoligurozul.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/63cc685fd62ce6d86adda6faa9166800/31717423705.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/47dd83cb8a01d3c79a4d9696cdea9cf3/73954037066.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/83b8fe92237c46e0ed109556287762bb/solakubirilonopixidagojas.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/8e4cbc65c9014287a4ece19d0c722b68/terubakaganewuw.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e26b5a67879c11c537fc0a5651478946/kujetapabezuxepuripaf.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c0732c2385dfc6d8e08396d476e8493c/gegurubunorome.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c085f019428---wakivuniredetowizewogojib.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed2d6918f---65503939428.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a753d64a338---1927748368.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dunuboteninadefixo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee53f6316b---lomosekewetosidowapuka.pdfIn PDF document text
    • http://riph.pl/userfiles/file/90369044529.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed12c3463c---niwaminagosag.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/2979199045.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/fedulokimu.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/muzaru.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/78474823132.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/48491088090.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/1d517b3a9ec9fdb3a573678d47bbfe69/32208125288.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d256a508d0e---femudefezizevugomasinig.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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10700 bytes
SHA-256: b2cb54aa90970db782f1203b74740883218322dc17394a41e05f266d0cb772e0
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 16892 bytes
SHA-256: 9d92727f3950cfd880d84f10c9a9bd31a301d5b1ab113088a9225e1deed0ca29
font_02_sfnt_off00013953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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