Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbf1f19809ad50c…

MALICIOUS

PDF

100.5 KB Created: 2021-07-16 02:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 677da078dce788327343ec2f8d1fba08 SHA-1: 7e53cf8a39f98bb98a37086d5f8b16e380a47206 SHA-256: 8bbf1f19809ad50cda4a4db6c96599b115992fc79af0c872015bd05c9285e7ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/fcb71bebef8d332cd1773116024359ac/84456983274.pdf In PDF document text
    • http://allaboutdowney.com/userimages/gipiron.pdfIn PDF document text
    • http://katachizu.com/img/news/files/61613796268.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/83137568888.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c225219a16---vofofumuvolufufenedev.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160928b7a6efe0---remosaxuvotekusetomurusa.pdfIn PDF document text
    • http://chapelguild.com/images/usr/96147068370.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/76855442705.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/gojenewolexelif.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7463a102ab---13671816815.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c509f3fa2---68008524846.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d606b7dc---zawof.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f397b039---bapawizezuv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zomevip.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5b973a26b---8999240742.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://fizjoactiv.eu/Upload/file/turaxevosobutagugetatet.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/74929669037.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/malawubevanirodijawuwiwe.pdfIn PDF document text
    • http://termocity.by/pics/files/fujun.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c184692b---bevasovemoravokolij.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/420115527.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/79167704534.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cac36a759c---56006683039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=one+up+wall+street+peter+lynch+pdfPDF 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_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 10832 bytes
SHA-256: 67e90d74da66230209d9d878cb55286dbc18e084fa12d69625cee9fc277a32b7
font_02_sfnt_off000153cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CD 18540 bytes
SHA-256: 5e54bdc841ba2614bee6bfe7f107318448dfac8994ff926cecb5714b61ac66d9

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