Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9ae3e0b033468b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 16:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bd92ffb044096b0f12d8d233ad6bab6d SHA-1: 79bbe4423dcb316624819521b750581ed5e77b67 SHA-256: 1d9ae3e0b033468b35f9c765e832f69e85748fe67a1624f35c9f50d4d4b6f623
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 0.9833

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://allamericannursing.com/userfiles/file/37492669119.pdf In PDF document text
    • https://nnt52.ru/userfiles/file/35491687894.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec3f4ec8c---numasenototuduwamul.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a98313d87e2---76362062949.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/lofejotasaso.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2425d8708---35804272744.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/92742905452.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210729_194853.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/gulumuw.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dexupamijubipevi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/kcapc0m5rfi8umi8baqk7mcub2/fasogepojuxepodot.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/15639220100.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fabuwefave.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8444f1872caf5d9316021647e94233cb/sudexefonifexadutimap.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/88864653494.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/divofufetexovo.pdfIn PDF document text
    • http://www.bash.cl/media/file/63902232496.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/5183156886.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4ffda4d5d1862107c90bd9c6470efe8d/98001037402.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b15bf578---dujomupakazifezaxotedo.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/36442677329.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0ajf9hcana0tf16118igf78p58/39014165016.pdfIn PDF document text
    • https://citytrafik.nu/images/file/makenekobetij.pdfIn PDF document text
    • http://aweibel.com/Photo/file/dugidozafasi.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/budisaf.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61975529953.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab507bb6b3b---xalazokawugum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=free+printable+english+grammar+worksheets+eslPDF 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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10992 bytes
SHA-256: d49573d6a891f70f24b76a697a48b25c6cb8ce034c982918234c97f212885406
font_01_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 17780 bytes
SHA-256: 0bdae95a954b5c8c69acdc7c22d84b1272a916807be6ed8aba07bd41bfb2a428
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1