Malicious PDF — malware analysis report

Static analysis result for SHA-256 8284dffe7bd9c0b0…

MALICIOUS

PDF

87.1 KB Created: 2021-08-10 23:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6b412a86310f9d4fc34f03682368bf02 SHA-1: 0596ff7b27f17db02b464762cb8cafdc5755c530 SHA-256: 8284dffe7bd9c0b01e05228c0b16ca07551087d893d63d0f1003726e6e5b3525
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://josephlillianmorrisfamily.com/clients/59960/File/64922660251.pdf In PDF document text
    • https://angkalaris.com/contents//files/20982515535.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f431dc2abf0ad1718199fbc275896c00/12916762787.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de8029f43---mimojiju.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/47034927428.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5d6a746b---niravogiv.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/varakida.pdfIn PDF document text
    • http://nfc.soo.jp/file/17377697802.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/37897883488.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/papitezabaragupefipakoj.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/35861571510.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vabebikufarajekogabujo.pdfIn PDF document text
    • https://iword.de/userfiles/file/29537897298.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/japabilutazomam.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/ravadiwefuwikoxev.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e8d8e3b8c5053ed12c72862cd4035c50/sudabonusozib.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862a0d8e030---jobawafalida.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ikinvbis1dsk3k32m4bgvpesa/geluwogik.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32ab7a4b76---xowikux.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/bedugisez.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/42943651137.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f05e22819---monitugon.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/589251923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=burma+tamil+hd+movie+free+downloadPDF 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_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 17232 bytes
SHA-256: 7de3cdfcac6980e3d78d151708a756173ee6af745996a24a3e96786d1ac1e232
font_01_sfnt_off00011e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13648 10756 bytes
SHA-256: 16ad6b06092f624e376f5bc58cc0737105c721d97a3ce3e691c3ac9ff5b77984