Malicious PDF — malware analysis report

Static analysis result for SHA-256 16da61744a08babc…

MALICIOUS

PDF

93.3 KB Created: 2021-07-03 15:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a65e2dc11529c6cba966f010990b415 SHA-1: b3f386d79c8167746e195f4f0e528793254d4b93 SHA-256: 16da61744a08babcde08a6337cae1867857bbab2a5500180e6b5c32d6299a549
164 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, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external URLs, some of which point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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://ewastexperts.com/userfiles/files/94290963523.pdf In PDF document text
    • http://atenngo.com/admin/sites/site/documents/borivixafilofisugufinup.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4c7254c35c2692196860eef613d5108/69958686809.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/19453436270.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/17172620486.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864652c140d---dakefedeba.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160771ea0b7fca---20125393679.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/62362234994.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/jakerexijusuden.pdfIn PDF document text
    • https://arerp.kr/data/file///senozudo.pdfIn PDF document text
    • https://miet.hu/kepek/jaduxiduse.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aec151de7---sivaroxitoxupuviru.pdfIn PDF document text
    • http://abpaluso.com/upload/file/40581299413.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/zelunamofezelapukar.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54d6350c3---butowojinajibeniziwi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0ba02d2a---namiwopuvitisuridesun.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a321161b7b---lanevugotubime.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/76a6f196f95d71626aa600c4efcd5715/42214862985.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10e923a34e0bb80aab72f3628f21b017/5421580875.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/12849753235.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/6p6ihr3hfafl4i4lfqba3u4q7q/finalulupanet.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8b5ba866c3c8c7afc495853562309d96/15361447093.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/4abmluiv9dng47o4h7gddapqus/tadosovuxuxotuboruzuwij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=healthcare+business+analyst+interview+questions+and+answersPDF 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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 11108 bytes
SHA-256: b1b311b6b60091e13018f0bafc7c4b3eb3f1dfe4b34c59a0d1c69399ef3a1b5c
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 17812 bytes
SHA-256: f05612ea6dc332df614059e9735787c5acf3b02e591338775c4d3f5ec453acc4
font_02_sfnt_off00014f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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