Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1dac69995241335…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 04:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f1bdb70e5d316aca7e9c9250b60a39d SHA-1: dad71da3415605e722ea89a1a5bd8f0aff023085 SHA-256: b1dac69995241335b2a4bb0675201160b3fc7c4517cd3181ec23689ba3bbf751
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter further supports a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=how+to+get+a+free+1000+v+bucks PDF link annotation
    • https://12shio4.com/contents/files/64814424084.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a64bf59cf1b2c6fcae28de683df26852/pabisojuxo.pdfIn PDF document text
    • http://lovesenergy.nl/file/nifoduvugibiloze.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vajunaxe.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/89767714331.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/juwokameruxadipabulired.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/burokomudawulox.pdfIn PDF document text
    • https://wrd13.com/force/file/8859455077.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/vifenifusiruruloraxisebas.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/5658353134.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/51319864007.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/39437398248.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/57ea6e56a33910afdff5d89947ae4deb/noketamodebaf.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/48247054805.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2a66e5105a9361369765a2e6c74b1a57/78020337773.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/1343264176.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ffe6cafe6---58271102738.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/silobarusiwunagubux.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/viguduravububiw.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/bijovuwodizobovukuma.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/43790071022.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/rofafapojujibutudaforoxe.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/wefepudekutazevuxibi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a4f5d65d---peletopimok.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 18620 bytes
SHA-256: b21177a671229b8ac8d07b1dcd0bc43d96414d9c36831f31d34fd2628aef4491
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 10916 bytes
SHA-256: 074c5899985955269a451c12596905651c7374a44480a342877368da3b95eb57