Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df094a5012f100f…

MALICIOUS

PDF

100.0 KB Created: 2021-07-03 20:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9b1474d3402e5411e026e838d9fc41c4 SHA-1: 8082802d64dbf9d459b9b56d3f6b07f1e48ec7d2 SHA-256: 2df094a5012f100f09d67cc6fdb5213e6940f1a3034e9ce41049c9677337ed8b
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. The file functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9704

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b550086c9---tijiturovivupixodixitozo.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/fejokubolep.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/01fd8aeefa1d28ecca1b7b5846ce4e08/bimuwiruzisefulinokufiso.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c886d67b0---16978434577.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b7f59901---pixadisomulowufan.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fiviwiworumideguni.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/getumolab.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/93205171231.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210628_73B13635DFCAC09E.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8103755deeca8b2832d97503501cbca9/88670288261.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b86f67e9eae---gololuruvijugakot.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c95e2b37d8b03837009b75230c8a73cc/86795671394.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9e291720---67435991403.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/fubavatesaditi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/dojepinobolet.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160adae76e3a04---povutivitubadevufaf.pdfIn PDF document text
    • http://diacritic.org/travel/app/webroot/img/files/vivupop.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dugigatodurifovokin.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5b8909387723d8136484b8542037a93a/7719484502.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/ditesumifiz.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd25779d988efc43d2b01de6c0422e16/xujovezutolitujikikizomub.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/35117946870.pdfIn PDF document text
    • http://yanartextil.com/firma/files/movipemuz.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac723261b4c---89660954029.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/subasaxalutarerurupot.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2217e2ece8---ruvefilabanivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pan%27s+labyrinth+the+labyrinth+of+the+faun+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10984 bytes
SHA-256: b9cc5b28b841331b44ef2ead67ba773169245b73c2edf7931b19012c5069baa1
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 16572 bytes
SHA-256: 13df7813bdd01323f6ccd46ea38cb003ee3d7d3a1a86031ce803a8da617ec56a
font_03_sfnt_off00015276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 17636 bytes
SHA-256: b19310038ef06f0f44a0d07a82a7976f4405d517535a6834a4dbcd83435bb905

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