Malicious PDF — malware analysis report

Static analysis result for SHA-256 323a1b7e080a8b8e…

MALICIOUS

PDF

103.5 KB Created: 2021-07-05 16:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0fd0c262b0ba5203a69efa8fc7f0fa3 SHA-1: 6570eeeccbb53de99de8f651f0f57578f75c05a8 SHA-256: 323a1b7e080a8b8ea02043a3acab6035b3efae4679c0dcf382588735aa44f9f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary function appears to be redirecting users through a series of links, likely to a final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=statics+and+strength+of+materials+7th+edition+pdf+free+download PDF link annotation
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe10715946---zekimomosefegopiduxalali.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c00efe6e---37327085917.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2e694bcfc0bb3cd61a4df7a3570cb150/79545438007.pdfIn PDF document text
    • https://tepihtrava.rs//files/guvufu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd17de4cd10---mepujotux.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9nqrn609c36rsgtsm37mqr8qq3/58344061890.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/sejagidunererotokilefo.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798126a4471---55658812120.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jubaxanenapekojabivadola.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160921bf6ab874---99419869473.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/560e51be67ad8852fbb098eb7b68adf9/gadejob.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/74739300152.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608948e9429bc---mulidupuj.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/narojapinogavirizixajo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e500d6bb---69570487516.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/afcbrrq3dgib3q0qsoqpauop7g/begegazagoxosufe.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/fakerukufiw.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f1e72dbb---98018993077.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4dfa8034d88bfbf8801d495c10eb50d7/83192347836.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/93182751600.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/volegemufuna.pdfIn PDF document text
    • http://bdn10.cz/files/file/paxejif.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/72441355865.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 18932 bytes
SHA-256: e703dc240830504d8d74a0eae330f141477f83620d722a4c40a51c93e1f76882
font_02_sfnt_off00015d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D32 16904 bytes
SHA-256: db8f0e91ca92cb8e7665ded0c4392b3a647cf5819bf67f2ffa322693e7e621bd
font_03_sfnt_off0001756b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1756B 11276 bytes
SHA-256: 1d936ea3a8b53bee1f1557d1e03837e0372021a635450b51b9b93fdd2b2863ed

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