Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d59947c1d7eb1fb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 01:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f873adfd8fee120f2c89fbedb5105635 SHA-1: be72decb8a212f5f69a6fd024e94d0d9353eed77 SHA-256: 1d59947c1d7eb1fb2e004111f656d044ad5c39f884d082f91acd8e2f398f9894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=ate%C5%9Ften+g%C3%B6mlek+pdf+oku PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607983bf2256d---51874928851.pdfIn PDF document text
    • http://toonesk.com/upload/puzotavapuvifivek.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062608260973499.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/27017638782.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b407d9642c2---1865322947.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/wikilenadiwusifazoromo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gedobovubebexogodijab.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nifinume.pdfIn PDF document text
    • http://rideco.hu/upload/file/44547608739.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/wetaminugumigin.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/73184787073.pdfIn PDF document text
    • http://land89.com/ckupload/files/gozumoxiwebowipagopoxom.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/41217263664.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108112237452098.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02a440d04---poxitojedivi.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/32543980925.pdfIn PDF document text
    • http://goref.ru/files/file/14110184099.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/18118657812.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5386c0c7---55772960173.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d17e6d7f6---rugedajivi.pdfIn PDF document text
    • http://builderall.info/userfiles/file/27880446656.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/lanofalomej.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/58421088042.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 18440 bytes
SHA-256: ad7c472d18b823ec090580a3639b0693f9d6fa4e439975a33444d83546f0e5b9
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 10948 bytes
SHA-256: 8895511775e56b9befbeb059d14e0a5d008c048d1ff4d21aa66572a044d12bd6

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