Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe05811d186590e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 14:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 935b1eea99cfe412caf07a2bcabd0dd5 SHA-1: 22f68c6a642b3b25743640bb0862be1bd9cb353d SHA-256: 8fe05811d186590eef4391dfd79386c2a66812739b7dd36f0fcd9b88bf6e7aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=allow+messenger+to+display+over+other+apps PDF link annotation
    • http://solar-makernavi.com/ckfinder/userfiles/files/jubuvosakidaxi.pdfIn PDF document text
    • http://freeski.hu/freeski/file/69120583126.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dbd594c09cf835ee7bd6677ec820f05c/wikije.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/pekapodutododurudulor.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/54462894009.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/kewaseb.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/39747154596.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/92146128841.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/sanomasum.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161363487333c2---26466609166.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/95840132316.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/37774618309.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/84136428912.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021c51c6c4---26935003486.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/13601346934.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210906_034613.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/21507822316.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420d71ccd3c---tejos.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/5368959863.pdfIn PDF document text
    • http://atrsara.ir/resource/files/6704063904.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/42945799818.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f262aae49d---91326882752.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/43423355484.pdfIn PDF document text
    • 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 11088 bytes
SHA-256: 799e3e0124404350026a0fefca33844908f64934a4877150c034f1f8ed28658d
font_01_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 18220 bytes
SHA-256: 2710bce6f859f88d62b2ceef12c7596715023a538f52dbf27a39934e3104171e
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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