Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bfd30ab604561b…

MALICIOUS

PDF

100.6 KB Created: 2021-08-14 07:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9405308232b6cdc54ecab747e8ddbab8 SHA-1: 249f9e83313c8fe5ac825e7f8f55c5953504c572 SHA-256: 85bfd30ab604561b078d5eea18ea5a5177a98223534d67942e3b1f931b7bdee2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to host and distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it's intended to lure users to malicious sites, likely for phishing or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8960811b9fde1b0d1afa76463be395f9/wadosoro.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768cb22455---vuxov.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/dubigisowawajeli.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/kukfdamo94a4tld7uhfplvbs90/24892809867.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/jvg0njk3vtb32vapp412f55jg7/biwikabaxoduwumitupirofad.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5f0decc2---90506199074.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c9f27807---4065334039.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/mekulofadofaxuditum.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5feed3069---ramipe.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908478a8d2---lanowefezegipeb.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2bc3d0b3b6746e673efb34183e98ce3e/11721894863.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607836c0497e7---tadafelimujututexaju.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/20252119293.pdfIn PDF document text
    • https://kompaspt2.com/contents//files/83585055625.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6b1a9a21e511eea7d738312bf1444b3f/gufokerelo.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098341abdddf---39508962947.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/botumapof.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/konirulo.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/satutibutos.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/50692627869.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/6798850404.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/45440bc5eb6cb45222af36d39a3617f3/47248549040.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce050ec1---65929800061.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/23237727962.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/ritikodomes.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb24808c1f---37705146065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+tell+if+a+molecule+is+paramagnetic+or+diamagneticPDF 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_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 28544 bytes
SHA-256: 1efe132cf7e6f6402d59562dd683fd8dfabd0cefe7382007b0d212f83605efe7
font_02_sfnt_off000167d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D8 11140 bytes
SHA-256: cee9a3a76475ba7705469d456eb460c83b78a0bd4245d7aec43951405de3846e