Malicious PDF — malware analysis report

Static analysis result for SHA-256 20575264c42b6e46…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 19:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cb91c3181a52d6da0128a8eb86306b6 SHA-1: fa64428d9c53d303f48793d47533257807e6b9a9 SHA-256: 20575264c42b6e46ff4573a929feb0f07d11d9467a28eb79842cf51650e98e36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606f932c4cf5c---59389963156.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d24affd---getojanasasinodibej.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vejate.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/4232209470.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/nezorabawi.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/ganesufov.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b30d9081af---nepomubifenetifobuwopiso.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n3s7i2vvrrmvqn6serap0c1m54/40342061874.pdfIn PDF document text
    • http://lblussana.it/images/file/nitabibi.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/wusifudenotebifemaba.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2cb1203f---robepazedawezumalebixite.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/navaxaxomijeren.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/38051240048.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210812081014.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/97297806034.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/dajinuzavuviluselaretu.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/570692143.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/winesubomusuz.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/45820085491.pdfIn PDF document text
    • http://acril.ru/ufiles/files/wufifonakorolopas.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210507005631367114574.pdfIn PDF document text
    • http://cortabellanews.com/userimages/varadeduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=learn+german+with+mnemonics+pdf+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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 17616 bytes
SHA-256: e5392f2cbb16e2a079bc994da46c26bda9ada9f4e015f1ced81c8d17161e9504
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 11112 bytes
SHA-256: 3c3d1e5458d1f77aa128a2b4b0f6a899788e88e557af53db18bec0086345c804
font_02_sfnt_off00011e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.