Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a8a30e99f96d22…

MALICIOUS

PDF

84.6 KB Created: 2021-07-20 19:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3a0b27b50075ec98106556a896ea3d8 SHA-1: d7b05ecaf97882168c93f98cec06529478b18a1f SHA-256: a0a8a30e99f96d22442f169d622bd3ee13d418d9f180350f8bd171c14700839b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, which is a common technique for phishing or distributing further malware. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://alteredcompta.com/buddha/ckfinder/userfiles/files/66763687644.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f5c9c433---71775318856.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/tawet.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/guladomuwufaxi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/6542290419.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/iwagiwotomalik.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2ecb53d69783b1c6dc1b097c0dcacaae/wafoxolasatal.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/76271404037.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6912c8a46b---lasewotarimoxozefotowubaj.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lidiwewor.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b80366da---92599826954.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d382fb4cb79---madugazonogibofemexoxeba.pdfIn PDF document text
    • https://alutat.com/data/file/juzazemavugedonubatenuv.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/resilopafalakuw.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jolekefegesodijexa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5357ef339d60a2ef86f44eff0f8de415/nujipedirajijuzetaf.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/23c724ea23caeb253e153faa260604b3/zewukuxijif.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3511b301---nekabonarun.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/zibexuzivukazifopegux.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9467243c31---xawelaxogubitimemi.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/94609182523.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b9285602---wadetubesototonawonivili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=stages+of+water+treatment+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_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 10864 bytes
SHA-256: 507fe3f178dac8efe080c57d5c23507da7f004ad4aa845e4ee4f425e13f32d86
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 16680 bytes
SHA-256: 70bf1a3a86206549c39b93e8ebea760f7ed5c51557aaf5b91b611405293e94d3
font_02_sfnt_off00012d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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