Malicious PDF — malware analysis report

Static analysis result for SHA-256 682f065afeefe569…

MALICIOUS

PDF

92.7 KB Created: 2021-06-27 07:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d705943f6a9eefdea13312572989c687 SHA-1: 57a345a1255dca92f9c442fe429ae9729ec90942 SHA-256: 682f065afeefe56930e040e7676034d5a435571c29a5509e1bca0621f29080e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to host malicious files or redirect users. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/cgftiltms8t4upjiu93gqlsgi4/3902558096.pdf In PDF document text
    • http://say-international.eu/userfiles/file/28425154484.pdfIn PDF document text
    • https://chp-travel.ir/data/file/34119591935.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a8326951e72---284143821.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/87088361326.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9118e600a---50309929744.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/rixexonulefiva.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3aaj51q98tuiumfvsla7h09q0s/riditatexut.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/dubuwoxifodoxosi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/59479916725.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b311a4bfecd---wepuwarupemopeb.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/22414383671.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8d7d863f---tenenozodososam.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2bd3705c708d9b7302d880906b9a097a/zurexokuxejed.pdfIn PDF document text
    • https://fishboat.hr/files/lepubisufepagotorik.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/dapinu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e79427aba---59629470339.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uld8bc5sibpcdjjt2om493o03a/kotazerogujizefunirolevak.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c528cf15b366ac7ef6a2b1fe9031e2a4/10979826141.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/99743163775.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/67075f252cc5c36554f3b4dc68b825d2/zomazenitirixuzalitog.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/pcdc04d992rq0g7sbqso3i5k8s/38639977846.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rkmdg3bfooi09d3sr57fujllt2/72580168333.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/tazesafumagiloripubewu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8k6js8mc9br0n1nno3te84a9s6/dolevawitu.pdfIn PDF document text
    • https://33mobility.net/uploads/files/78786087409.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/wusanixanununifapeg.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ca5e8567---gibofuzekutiritosumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=issues+of+child+labour+magnitude+causes+effects+and+responsePDF 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_off00010500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10500 11256 bytes
SHA-256: 03437f023f9f806a59312d574e1cc0aaccdb22494b8161ab5c8f555e9ab4e603
font_01_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 17932 bytes
SHA-256: 0ab26ac1161296fb5149e9825b3d4ca174145ae23b0d500b7c5baf5478271078
font_02_sfnt_off00014caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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