Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb4c03389be9dfc…

MALICIOUS

PDF

91.9 KB Created: 2021-07-05 20:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a81bbd2106f186ba4faa460ae442f9c3 SHA-1: bda3151ac77ac833a4eb3e27b54f341fc74e3d61 SHA-256: 0bb4c03389be9dfc38f951ec7f706279bbfb452a093bcf7917e49b2603ffc482
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 0.9937

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 http://cuacuonanbinh.com/userfiles/file/67183900800.pdf In PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/g58afrm7s9mfoaj6tdiuino87l/mepetadefodinejanotanu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e59befaa---bilotojurunuruwilekigem.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/zegevetitagilemimojo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/e30c87a0c5dc3dd481f21ea5809a8963/75984529013.pdfIn PDF document text
    • http://charivne.info/images/file/medasikajim.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/85885022073.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/mupax.pdfIn PDF document text
    • http://nakatka.com/files/file/15064433500.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb8d759c02---93557664857.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/61355827780.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/60495183940.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65cc19e79---66975219914.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedc5b50c2---21209484807.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/winovar.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/77549937275.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/gukoxutubum.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/322729b06593879c76115ba74bc10de7/21090403299.pdfIn PDF document text
    • https://petikdaun.com/contents//files/96675050225.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/46664890573.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e39e1c3a0---36738179972.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kdncmal4634kilbmf94fplhf05/wasetog.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/fomokepeluma.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3uu85qms8s1rfibe5bv5odple1/jorixupedo.pdfIn PDF document text
    • https://bselink.com/userfiles/file/gotimepilaludupalebeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=universal+ceiling+fan+remote+control+kit+manualPDF 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_off000103bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BB 10944 bytes
SHA-256: df8066232cc133283e26d0ff1c4d716228ac18f3dadaf437c31db4cedae1fa76
font_01_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 17268 bytes
SHA-256: 594a775b0d792f4a87a321bf7cc464475514fe114fcaae49174a69737d3373aa
font_02_sfnt_off00014a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1