Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b4cca236f9e891…

MALICIOUS

PDF

78.2 KB Created: 2021-07-05 00:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 99be76a5ceb7b72fa91119a58a9bd3fc SHA-1: be68a9c2be8163284e0b62f0475f5558aaa95c81 SHA-256: b7b4cca236f9e891cb2a77aad26ba73f47af231887eb28c9b49f6060f59e8ea5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, rather than containing a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://cipetbhopal.com/webimg/files/fonopodezik.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160890d7309f3f---fedemazozow.pdfIn PDF document text
    • https://ebooksweb.net/files/file/nemakosiwewopipetuz.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/8novi08a73ej3ac6s16is8ifm0/xukebofumefirilotizak.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c317e1ba3d3---kibaxafewududamigukidoziz.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071d66ef3e0b---40842401284.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/32681340352.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/35267235061.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/sezufasopopi.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/zusejasuxeb.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/77394687020.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/repavojagoses.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wiworibefebirakeporakiv.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f150a29ea---23427472615.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ff93f0f14c42ce5606b5d2cc58151af/58289016802.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5392e901db4c236c5fe805ba844b6866/lusedazuzugirosuwo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c8880e6c60d---ximovenasiwabaronabuxuwox.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7dd1ec2c7023ea563e5fdeee11268933/78281804544.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c601d51db06307834876927a684fd539/bafizez.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/depigiki.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kowazedesixumof.pdfIn PDF document text
    • https://zold-kommando.hu/files/16709395895.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/porinosafifatabuku.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eo4ub3i1kengp8oephi2cffm7l/buxona.pdfIn PDF document text
    • http://accessoriesunlimitedinc.net/catalog/file/72455895308.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigutogag.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/84078809114.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fca981dc430b4f490e93ee900aa257fc/83540150981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fairy+tail+episode+1+subPDF 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_off0000cfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC4 10664 bytes
SHA-256: dfeebac65d80c2fb2e8762e02e62d67685784364a9ad692b3cd9722fcb5200bf
font_01_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16796 bytes
SHA-256: b5f97f50d89ca4f6bdbc89cb39289ef0c70583d22840fec659876d3918eee457
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1