Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f763a71efd1199…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 06:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bcddee3e103d29940715806740ad681 SHA-1: e7bef887310f66d34b1b1d382c6ba572ebbaa32f SHA-256: f4f763a71efd11998ff04c40faf7b25569c2f7922d2d79383e04295e9c2c3345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://17njl.com/userfiles/files/gaponamefufesato.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/gldfiqqo2o94n491vci8hucres/zunepezezazibuletom.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/176736837.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/kigiwo.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a433f46f33---gubumulijanewadiso.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/voxilufibafuwev.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/zamakumepuzukitagobav.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/78602762255.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129edd043490---befapejanedalenusuvot.pdfIn PDF document text
    • https://o-dance.com/upload/files/mibedawigomuz.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/lujutum.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/78987600999.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ta29rnj6j9ouavci1h3ou2vkjl/lizawejidudefunitigujodim.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2802bbbe---navobonituvezowibu.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/doderuzegogujoriruxibusi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f9d51762e355806bb5428e5a830f86c9/97723638583.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8424f0f3---99285498091.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/59eeacba433246e9d399f71ba1c4c12b/zobugilawevovimobogal.pdfIn PDF document text
    • https://drlanda.hu/user/file/47628585965.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/17303984765.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd697e07ece---tejopivo.pdfIn PDF document text
    • http://greenbrier101.com/userimages/gokuxowigexaxodakal.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/rogokebanasu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4049c2d7---jujerumegod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=innovation+funnel+definition+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 17688 bytes
SHA-256: eed2bc8b594c4eeb45a82d7a1a14de91ed553c91da258fd05e7f2eadd075f470
font_01_sfnt_off00011d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8A 10340 bytes
SHA-256: 1edb9d9c7c9b3f1ee27cc01afcd8624e121200f61581e86fe5d3cdc6418ff127
font_02_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1