Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb2dac6e8520429…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 08:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c8997f873bcb059c0e18b004ecbb7aaa SHA-1: e5b6ddeace90372f3499b2e3835b9f2894648b4f SHA-256: 0fb2dac6e85204296800eb902add7de52d43886465decf33ec04650b2df992a9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the technical indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mimpishio1bet.net/contents//files/kakefepipefedikojuwesebew.pdf In PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/21cb4a3228891298ddc09b2b12a66a01/2160196840.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/sezoxawij.pdfIn PDF document text
    • https://ewt.cz/res/file/zoxuxididiwugasorikosiso.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/qut457m9t1rklsql7a1m24rbah/nigokotukofamufetijazore.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qjk5b9s5h73hi7h0j9tbafe7k5/judamikalepelovisejazided.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/kaxagofoliwinunisagu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/49894965858.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607887d453dbd---29293705470.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601131238626452.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b418e206daf---98838662253.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/41742913474.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/nuwawufizutobedubosamuzu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/74512661885.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/b1lo5rvp6o2ju7gbh8ekivrj85/xelikisupok.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e7c514a8cf76c697fbca7f71f48f05af/22683291973.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/4qlbdcghgstqk7m4gj21u7cfnh/wipimid.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210528_0C3159A0147F8C9D.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6kn03d7j88jt38jr2tlsoonj6s/tijazuxizepuzu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094849ef3b26---97499124326.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/59505476283.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c101976e7b---fapefesepetilo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f20f19ac---ripusufobatupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ethnography+qualitative+research+examplesPDF 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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 11332 bytes
SHA-256: 0443b676543c041b1b70be86583d09bca001525be80fee088c2048c3cd0e4f92
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 16488 bytes
SHA-256: a58bb501f1b379b28fde542d8ce9560a865f90e021e15c86a703c879ca61d468

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