Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d17498aaec53b7…

MALICIOUS

PDF

96.9 KB Created: 2021-08-14 15:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4298b41afb40b2cb9b6f65705911187 SHA-1: d5cdc8c8aed51600c38246d10f90568e54ed9ac2 SHA-256: 51d17498aaec53b7c1afc606c3f6500c45c41a07d84e40a84eaa5eceec29ceee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for users to download further malicious content. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0a6349a51---38427593331.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/vqi7u6ta837a7r89am9qcfli3v/gugepadoxoluguk.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fbad3fd0---revopedupifegog.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c71d1a0b09b33ab420e7d3dda100bff1/45145791132.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/14214029042.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19843919007.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/93768800719.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdddcb9e44---remuvejolijufixelegu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/83309258337.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tolivuburin.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/60551045909.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff72ae501c---5875014518.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d2f459b76d2af501e5b4e855327c861c/najegalotijim.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/32235830256.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///senibus.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/93f51ea2036c35690496ed644949cb70/3167815765.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9909bc49---vowurokujebekalone.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/36981885335.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160803e683351b---wizifeteweferidinub.pdfIn PDF document text
    • http://i-biohealth.com/files/zibovozowalep.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607171fd1343a---posexaravad.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/51110113654.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a44cd8bcb0ac48f5c9202ce1805e51d8/70938696025.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095edf39638b---72271701932.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/14eb4396d7aa66e41f426461f293c200/vovabuzubukulefela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+gta+3+for+android+apk%2Bdata+highly+compressedPDF 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
font_00_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 16376 bytes
SHA-256: 0b5448c6de0ed0f116d2c680d9cb6f47e90a51602807fce3603fd82f599d96d4
font_01_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 11532 bytes
SHA-256: 651a5c8f11568274b1503b788e12b7dde4f32393b2e8adf983d0603a399c059c
font_02_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 17704 bytes
SHA-256: c80d65703539b77755cefb811529435e04e9430acece565a43b209dd112e471b
font_03_sfnt_off00015c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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