Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce8ef2ae8728746…

MALICIOUS

PDF

104.3 KB Created: 2021-06-26 06:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9d28d6e41830811ebf194d1e5260c033 SHA-1: 11cf832b49c5f59206f86eb9ed11854d6d80f9f1 SHA-256: fce8ef2ae87287460cc2bf166f8a9c241e00afbc8c202ba27dc0d0bfabfdb9b9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, aligning with a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882db61168c---31400742163.pdf In PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/puzozamazobavakodedejik.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53176422574.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a419dc21c34---zetev.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/62424328207.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/degakobekuvofukizo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd591f4fc---51567334246.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609253b934ba3---22007164671.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/43967818732.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/gefumubegefisewux.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/eda0da9cc80ebdf97886927cb39f2625/jetufexavakulisa.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/96805c5787873abd3914ca922271666f/wojowonefifamok.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/61861824915.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/59862919148.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b7772d81c9aa45c32297c2d2b565a98d/31786898808.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160853ada977c5---nanutepejasum.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7801137115---vufotemerutebijeman.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7057bc503c---9599260476.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c4bbcfa1---88464517557.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/69dr126p0jj6tev7ctsa7e0v9v/zegobon.pdfIn PDF document text
    • https://semut73.com/contents//files/66851021698.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8e1a4397119b2c921d89d194b69214c6/fobipid.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160924a47f065f---dazug.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4f8a886bdfd90182345a1e060d6a2fcd/45398173843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=reactive+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000127f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x127F9 28656 bytes
SHA-256: ebace458f6486b538d3e66e20f649d7a5f3871dec7034c86c785bc4848f8bb30
font_00_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_02_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 10568 bytes
SHA-256: 80d5042b99ea671bdd326276767fe9470c2561322baffb17ad1ee1bf7cf3d056
font_04_sfnt_off00015b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B59 22448 bytes
SHA-256: cdbbb365fb3338b2eded369da5e71087441391845dfdba377567e59038bc8cef

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