Malicious PDF — malware analysis report

Static analysis result for SHA-256 c860bad5b67d38f1…

MALICIOUS

PDF

86.7 KB Created: 2021-07-16 22:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 42cf119046ac3b833eaa18e948483f6f SHA-1: 8741c62263dedd615358953dacdc30b581446b7b SHA-256: c860bad5b67d38f1cd6bcac7ccf93ad4060e7b6fcb155e7bf51c24dcedf4b313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dd862da950f6c11d639c552e731eb527/63992421987.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ec0f8b252---texasuzukunarovaj.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/sijasobipu.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/95130069592.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/gifekixogate.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160acbcc54b054---1234677270.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/gdvjebfnme0uijbieddcmi0eum/radoxujasekofavolawaruri.pdfIn PDF document text
    • http://pbsdeltarho50events.org/clients/d/dc/dc3fcb918f61c9276c5829b035df2abc/File/deziviradupijak.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/17ffdefe682b7113a9d62d2a5d9c3cf6/mimozusofijurolu.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/zutevudisem.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077b95a31d72---pexiriwi.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/xukulixujameji.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/57819022767.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/523e6e89faceda28ffde51406e16b0e4/ripuxelazekusufijikexaw.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/9fb164e5d6b3d185d014c1eaa1f92945/lomogegamonofikagedemix.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/46b497t0qtc8d2gb890p310k76/fibafatiseruxovezitojebop.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0a92ccf6bc13e1047aedde2016e76afc/kovojewoxope.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4670e6a1246c9e1690ecd73c9d9a585f/dudanibagazazamikudes.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9aaec4d0944dc6581606043dc18c2e3f/25913085932.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/vopapodufuzerubawam.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/93480163041.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tfv30dqijnhas09kn3vcr8jm63/87759906818.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/88214991160.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a581ccedd---93157226663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+48+laws+of+power+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012147.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12147 23264 bytes
SHA-256: 3d1adb4b956a8d9dd8bf6993682bea0a5bd49ba1c32dd03d76949e7e24531fd2
font_00_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 10764 bytes
SHA-256: 9e1cc6697dd1df2bb5a14f7f726d8622753fb3de7dd4cd651825cf1be15ef249
font_01_sfnt_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 16708 bytes
SHA-256: b13b63abd0401816e7157e050cb7d50f9c889c80c6f92ef6e6990cfffd1a6032

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