Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07b6ed523d0f1c6…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 10:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcd689e5d1308ac03b34381f844766c0 SHA-1: f46d607eca00fc8d778aa6efad47058a9e41796a SHA-256: f07b6ed523d0f1c634ff29ecb471af49ae4d87b422cb1dc6d1b53ed4be47bc78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking links, likely leading to phishing or malware downloads.

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 http://masan315.net/board/imagefile/file/41309737793.pdf In PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/lalajodijevumufeno.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/96090553808.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/52251598731.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/37120357071.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/71005096085.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/41886326542.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/piponomiwoxul.pdfIn PDF document text
    • https://costarica4d.com/contents/files/36627809897.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bafeferag.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/tufogalofumosusu.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/96512815055.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/16883455946.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/xomefufumiwowokod.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/tiwoku.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613525c4af2a0---raxipekavodasobiw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/76822525844.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/wutimuwunofotowowizetigug.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613878a5e6666---70490834763.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc3d1043e---faregorexutomiwofex.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/9063114828.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/kiniregobonopalul.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/nisegajaxegefujugulew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ftp+server+apk+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_off0000d4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 18872 bytes
SHA-256: 3a17f1f8b77c6f15cee0e83dbc9a50baabdfa79d4c94119d654554530f5d3473
font_02_sfnt_off00011e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E22 10516 bytes
SHA-256: 7f97aadb726c18075493a58452d09f9c3b0235a2d3dcfc71820a1ab8ee998cb8