Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b05f83b2dade51…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 10:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af85e61bec524c432bb9dc5cf2e35bb1 SHA-1: e7de94a84a15deef8b9dd65b848dd677102f3b0d SHA-256: 64b05f83b2dade51a9857e190c7919eb87323071d0df6a50fb7e6640b494f4a5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a1cdc2117ee74ba5f54d105293ef938c/88008798762.pdf In PDF document text
    • http://ebiocell.com/uploadfile/file///2021091109165882.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/fizewuzuduna.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/46977356325.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/majalubejomin.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/kufanevukezopoxiwadoxer.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/jugitinuroraz.pdfIn PDF document text
    • https://agatanorek.com/files/file/39336867567.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3f23e7c0---zatomeregeburavewodofo.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/padumukusuv.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/99805249917.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/bdcbe2059db9b1fc7fe8b3f5e8c4c6b9.pdfIn PDF document text
    • http://praguetransfer.com/files/file/riwanufodonul.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/5113512711.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/23968780149.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/de0f073dcdf4196f01f8ac52ec2ec592/77374455339.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/zujujalibisa.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/pifixutavu.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/66760443804.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/manidowo.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021951930466732.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/ximinipo.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210901083209386985vmn6ha.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/83812872810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+most+superior+part+of+the+stomach+is+thePDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10660 bytes
SHA-256: 2cb4e3be166a078bb04a1b288cf86557c1d2c2041b47d4b4f68692c42e30b831
font_01_sfnt_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 16172 bytes
SHA-256: dba5221d5dde3162d06d3aa8bb6205967863d4ca9a361884d78f83d267d78a57
font_02_sfnt_off000123ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1