Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3162262d34a3cc6…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cca5f067954888a89c82eee672d5286e SHA-1: f2c59087906fe09558f8dc31374b01b053ad0058 SHA-256: f3162262d34a3cc647024fce31e950f9d7179e5798dd1620dda03b4bfbbcfad4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites and disposable hosting domains, which is a common tactic for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/91b9cf940f67075569e0a91bde39f03b/votusavudofanamaretugaxe.pdf In PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/koreniwiwiwed.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/83126207014.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/68738646230.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/81249204475.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21ef99cae7---52889626851.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/79298395186.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/34754693793.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd0a6ada5e---fuzapamanixolomekuzoj.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/pikotanega.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/50565099053.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b7e1692d---2724974544.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c49077281ea---ditudigalilamageriwujew.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160802cba552d5---kazeto.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/18152430760.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/binolujuwalokiwemukur.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/zepurubavada.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/xefegut.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/nunefemudikeranu.pdfIn PDF document text
    • https://alutat.com/data/file/fesivenipotev.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6a65148f1---85993009834.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/bexufubapeferevokukali.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/guxudurotojavo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/7fr8g4ogb067cchi6qovs6juvc/8874653919.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pi963anudnrbl3j0pmc2fks39q/72186787231.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/45513417893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+does+the+anther+of+a+flower+doPDF 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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 10436 bytes
SHA-256: 3e1403474c29a624b56a58bba7181551a2a7a04d3f5d045135d21f615ea545e5
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 16956 bytes
SHA-256: 3bbdfd8ce4d52dbf9c11ee8731f1ad2514926a12464412790dd82fb37e4e2fdb

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