Malicious PDF — malware analysis report

Static analysis result for SHA-256 87df7bab53717746…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 05:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c3eeb9e8d31fd0d18726d7b46f4c23e0 SHA-1: 77c2f44fdfc8ac0c184b1ee4071b64abdce01374 SHA-256: 87df7bab53717746c6e433275df1279f1adc9c9771f7b3f3dca01fc92e975262
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous PDFs hosted on compromised CMS uploads and disposable hosting. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to unknown PDF files, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://marcelponjee.nl/ponjeefiles/file/37316211287.pdf In PDF document text
    • https://chung-pei.com/userfiles/file/56015183264.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/38161061251.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/luvokafefamokapik.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2a9cb03872f787fcca4f277126653cd5/vozalorolu.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///valamav.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/gusadokijedik.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/bejiregijeb.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/kologiwivilis.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd721f0c55---zifufedabaxojolixukide.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/zozijekupuraxofened.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e665acf724cf509259abc611c962008/pugotutomijazotinirorupa.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gawebuxokutop.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16115e8efb15f8---bumuwisoxetafopabixisiku.pdfIn PDF document text
    • http://acril.ru/ufiles/files/4241572613.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/nubaxekowudidotok.pdfIn PDF document text
    • http://webursitet.org/Files/file/53022694144.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ad7c2b60---67505371660.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/lemowowuzopafako.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/sotaromalolod.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/pofegam.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161125e88b7466---1634057864.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/robofofikinufebamiko.pdfIn PDF document text
    • https://rcot.org/userfiles/file/pigukajeguxaronakuza.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202108051824217231.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/ik51te7mdc5ruug8lk8ofijveq/miwuwenagumoluxebew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=free+music+quizzes+with+answersPDF 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 17148 bytes
SHA-256: d85e2b44af177834319cd2f3604a46bbd7bd65e8cbd44b388df504597724614a
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 10696 bytes
SHA-256: f6005b4003ed8f816d1f2e0e940097655c27ac34ab50ff4e36dd968bc37ef723
font_02_sfnt_off00012064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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