Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f57f11ba4c42e72…

MALICIOUS

PDF

74.8 KB Created: 2021-10-12 11:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1dc9e7b87d30b414b122cae527257210 SHA-1: 50c69eea24f56b8408f74de33d78261a333a0b45 SHA-256: 8f57f11ba4c42e722c32b5dab6ce5faf165bd7e6dfec5f2bdaaac04b164587e9
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to facilitate initial access, likely through a phishing lure, leading to further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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
  • 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://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/93026912123.pdf In PDF document text
    • https://bhsbeacon.com/FCKeditor/file/81750525407.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c71f48eaa8---5166644600.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/zunoragik.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614455bdba003---gomeki.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/61214810412.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/maxap.pdfIn PDF document text
    • http://landia-print.com/pdir/file/15517958962.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/kugitivep.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/83594683501.pdfIn PDF document text
    • http://aurora-c.jp/files/files/69888956783.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/xozekaturaparazuta.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/44321851964.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/xamivi.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/raroju.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/20976052472.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/lurafilatenagujepiw.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/refafiziguvaju.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6bbfedcaac5cf012a65639bbfff48772/zijamedoxen.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/9236968460.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/lilosapabokive.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a0e1aae5---fivadaminimifofomun.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/18530959669.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/bawawojiwegulutemi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BGAemAmcdTc/uplcv?utm_term=the+money+supply+curve+is+vertical+becausePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 19096 bytes
SHA-256: ad8aa9e7f653b1055fc4dc031d860fd156ffcc725fa889c505f4a10a4c16f7c2