Malicious PDF — malware analysis report

Static analysis result for SHA-256 8831ccf6032130be…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 04:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d7bac53b0f1ff2268ecee4ecd670fc1f SHA-1: ac09ff61e479ac5ba1a31e18d100f6933a5ea61b SHA-256: 8831ccf6032130be37b2948a66eb4aa6ea445c3bc399bf367c4fb8fbcc84d8c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by leveraging these external links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://taevlingar.se/images/pages/file/zidafi.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/lugitinofavovo.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fcf58245---11209947061.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/91876001129.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/97002382734.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3e1aeb9b7a38732aeb86023412afa29d/katavogabatogibuvusewitud.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160758757938fe---xivilixudig.pdfIn PDF document text
    • http://siembra.me/uploads/files/96551541407.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/23294514015.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/jofibupuxojolejojexono.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30448f19ec---90060905140.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/70cl5r1c03qeaue3o6il84q4s8/sofuximoguvedasagud.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/66416264951.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/fagegadigulanifibazixe.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e98c6dfb---34985671902.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4256f2786e9a962939d49c604718f478/dajivak.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f95cf06a39654445640d7d28cdee8540/39566672295.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/wokavo.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/2083489182.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879f5cafe5e---28121315342.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/95380031043.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb5e07b376---wisularapogatizazewuzuvix.pdfIn PDF document text
    • http://championsview.net/userimages/pegixapevowugifew.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2b0ecf51491edaa261e524a6adf53228/61063815475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lcm+of+6+10+and+12PDF 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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 17148 bytes
SHA-256: 911a24dcab0c49a898feadaa4200de5aa8a69a2457a6c64057553584945197cf
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10420 bytes
SHA-256: 9c879c26f3f385dad04ec96e81af565d1dd2c48134e38ac9a72ff3225b32eca7
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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