Malicious PDF — malware analysis report

Static analysis result for SHA-256 d915d9145e116a70…

MALICIOUS

PDF

93.8 KB Created: 2021-08-29 23:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 213a9133e0f0b9d31e5c6166c46c4161 SHA-1: 186fc86f5069ab1b83637761108fe654c8a27416 SHA-256: d915d9145e116a707b66db2b0cd3dbff6a825e39be40d514f76c632311bf27fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://garglob.ru/uplcv?utm_term=actinomycosis+of+jaw PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa0db5d41d---57563508343.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ec4676308d29f9ee6d44dc134e7e1532/12793832677.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/junid.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/322ed0eae69e27c8ffb6196afe2f686c/jomapogar.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xevonovut.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/tmv5p84p3v05vbdnffdk6lhcq4/tewiratakisapagefifopus.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/viwukibomimeregufo.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021081822114538.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a0dca1616---38565661716.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/75527629758.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/10961258573.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd17b21c8---35979614304.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/34083962874.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c4782e86ce58d4f7b11aec73e3e9f3ae/maxekasunugofidajim.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c36df84f93b---kumepojowufofos.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/21240227199.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/37011582223.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6nmtadf8mn43e5j338322fdmov/reronitevefunobe.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b09642bae---86940882018.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jdjr040rr1i1irigksk47v9bj6/1664914635.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/viwepufaziwubelisulaz.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/xovediluxosovipafujogula.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/pabemalikusa.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c496a541309---gelemilukewabukegupot.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/39933017314.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bf999172---22026807983.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/japefoxubedesonawa.pdfIn PDF document text
    • 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_off00010a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10528 bytes
SHA-256: dff8654b2d4f1ca3c6d10d8d4b6fd7af614211c7fea3fb6209de270a6197f544
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 17724 bytes
SHA-256: 24a3190bd737b9df8d6a9626474d28c2457ce2aa7dc92369646174e99be6dac9
font_02_sfnt_off0001503b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1