Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6f6037611e1a70…

MALICIOUS

PDF

105.0 KB Created: 2021-09-03 13:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25bff644de17c4ba43352203181868ff SHA-1: a3f4d196ae4aa6136d59d73ba7dcea1bde5028c2 SHA-256: 4a6f6037611e1a70f2562ebb30e8b43e3ebee6f358c106b677115080b540ba54
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, some of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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 http://bajcsidavidfoto.com/_user/file/memivozezezomanolufizid.pdf In PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/5176521072.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/zujisabikaxiponeremu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796c835a9f2---fukububewunugarijo.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/womofesaxebotamogijolow.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/60243868597.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117143226443---sifukamisovida.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8f1d3acfece332d2ad5f0aa2f7e85e7e/vozegonaraj.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/gerakaxilizikewederunafa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e74d08eb---mupapulidapiwubexanejeva.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/nuguruvizidewatas.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m0c0ku8i3tofsf7msbknhi43mt/revexoronijuk.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e8bd572d6---kijanebuvuwuxotebewu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/rurifotiromovabopiged.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1ce5ba5c9---97599585610.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bc010a8199c415ed217d00ccb11b92fa/sopuxuxivoxukijot.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/38459056874.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4196d06d32---xilidobuzenaxew.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/26547827868.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210601_112612.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/karuninirabemivozejuke.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xibawuvawizazijokebaz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607a263f5f53f---bimugeju.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/36397888582.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26af89a57---xisakanib.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbb5e9ed2---boselobuzuroda.pdfIn PDF document text
    • http://sjhtractor.com/d/files/72412895509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cash+flow+statement+exercises+and+solutions+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_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FB 18836 bytes
SHA-256: 2b1a34b71dba710084b7dedfc263279b9e006fa1a1ea9b770d95edc99f70be19
font_02_sfnt_off00017b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B68 11204 bytes
SHA-256: 1309f9d0e14fe26abf990520eee731788dd40dbe30b3c13761889b8088632cea

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