Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea8f652169d84ab…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 19:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2fb2495390cf5c1403306ed9abdca77c SHA-1: d2b611be14a872af74f11eea0223fe26a9514a2b SHA-256: 0ea8f652169d84abfe6dd0bbc04a0c879c64bfe6cf53e870493a65ebd2088f19
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613173ae2ed72---nasinilugotoxinexediva.pdf In PDF document text
    • http://hrt-foto.hu/_user/file/jeliligalobedizirujare.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/vatigigaruwetuk.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/90035112364.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/fifesogadoridavupet.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/varurasikiwamilefav.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/newuxaba.pdfIn PDF document text
    • https://www.confirmedtour.com/files/10237557264.pdfIn PDF document text
    • https://rajaunited.com/contents/files/61335626573.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/42799897161.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/93109604435.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/96787469865.pdfIn PDF document text
    • https://bliznacite.com/files/59514957009.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/48938015018.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/widuvemizok.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/73399106597.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/87990441971.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2e81c9c2---71049774544.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/69420793174.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/65229918558.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613174c856249---fededirudevu.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/dowuwomodibejudekomifi.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/98338671064.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f94ae468cd27e830c850b676d8e15ab7/jiwureserimotusat.pdfIn PDF document text
    • https://camphacement.vn/upload/files/tefakobafevowojireborerid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+migrate+data+from+iphone+to+androidPDF 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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 18128 bytes
SHA-256: e094725996dd649092ab786e1babb5e2c1f3d99b8b10b636a3c30018211c8b69
font_01_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10808 bytes
SHA-256: 0992197a69eeb55bdaafdb740042de5072b8e245f7b1872134962a153eb6bcee
font_02_sfnt_off00013723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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