Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0836aeb955b82a…

MALICIOUS

PDF

76.2 KB Created: 2021-07-01 20:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f67dfa846d5a5df9409019ddb828bc62 SHA-1: 96a514db04b7a4ea8cafc9f1f97d2cb2dab9001b SHA-256: 5a0836aeb955b82a8cf449a58579a427a42a50ae8418fb735fc5ebb3011af2f2
176 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 a machine learning classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a raw IP address in one of the URIs further indicates a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://tenfci.org/userfiles/file/82522502059.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/26451063cfcd88c879bb2886cad4af44/15669430539.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/xoteda.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e46f53359cb212f02df8e3a154006a6b/gotejejo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6147b3ef80---tumok.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/uv6a623406cvbr9iie4os4rfne/vukoni.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210602_A3CEE4E1B072CBF1.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/ruxoga.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/76114747871.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/16603350530.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4f47a1f3747708d284d86bf53ab5c3a0/14306818575.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c0f418266db05b851350ca039a5f91ec/68869732874.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/703afc7ef9b7f1477535a851de1d43c9/98068769897.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/dulajixajaz.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842a3bc6b0---fojajeseguzivelonizefov.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/24065788c9ea792ba1a373a91478957a/33057824961.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da225c083df---sevagebezuwato.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/87770349251.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4hnlku3riuvafcsdgj9j7a51o/63363553986.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/18357892944.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088481746a9b---zerebukaj.pdfPDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1cf9cba8---18360497150.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e6b1ba88---96239510472.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/66bc15eb2e9f6cfd9e7b85986c21c31b/74999734012.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/gufezotewikekanikidoxuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=solar+energy+materials+and+solar+cells+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_off0000c656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 11152 bytes
SHA-256: 5f3123b03dd6a902c45b856d55777bc75e6aeaacafab8322502beedaee5f5ea9
font_01_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 16756 bytes
SHA-256: b19d68c4ea8c35782e07ca1716d41624e5aac5547d3e77eec7836bf6c6a8cd24
font_02_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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