Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ff8fcdd7aebf27…

MALICIOUS

PDF

88.7 KB Created: 2021-08-08 16:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0702eeddbfa32638e7b7b78e8adf0490 SHA-1: f34d3d4e21b3426824ba29d0f5ebbae6aa662b53 SHA-256: 49ff8fcdd7aebf27cf859b4a787d421eafa88ee3e6835b944eabbef7b900d8c0
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a ML classifier and ClamAV, and contains numerous embedded URLs. These URLs point to compromised WordPress sites that host further PDF files, indicating a link farm designed to distribute malicious content. The presence of multiple compromised domains suggests a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ad346954e33045dd2d23dcdae7e1dced/nenolalupeteralu.pdf In PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3817144cb36f6e3d6a82d7575cdbd970/46579375958.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a2750c22---besagozom.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f342c1fd0f---fakamatipiv.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/lr0np4vs48q56055f9bit6ncdl/felubaw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078445d22ea6---gejiragezubar.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rifivugagapuwo.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/xitepuwiwugusoweridiged.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vdusvd65bpjvqrb3ktkg6qd251/59780818100.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad23dd7af0---zubulomovute.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dkkhqrjkj7m206049gedbptfie/fosineno.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/eb79238cf5a49e77fcf79d47bd9a8362/18803385334.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/52514067765.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/21404218146.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/pegaketulixaporawirixesez.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a822584cc59---xilukefifumefalo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51d7f25b8---6257045637.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d7aa1cc61---75273367694.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/toxevasax.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/edae6d7acbc858d46fd399d3deeab368/dulowedod.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/gamela.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95d78b8d4---28035269690.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/40171323.pdfIn PDF document text
    • http://boxethai38.com/upload/file/51279542949.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/shvokck1qb48a0p8774ua2veg0/raruziwiwuv.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kebixufijajexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=functional+analysis+elias+stein+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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 17120 bytes
SHA-256: 9ea8513c6baca02b6bf81ae37d91f68c6505a0404865c22e79d8e62b999a79ac
font_01_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 10704 bytes
SHA-256: 784f51953d26df63d66629eca638de158cb4465a9ee3969b2a5178ae99afb9a3

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