Malicious PDF — malware analysis report

Static analysis result for SHA-256 9176f0dbcfced5a3…

MALICIOUS

PDF

73.4 KB Created: 2021-06-06 12:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: adb34149e828ccfd0a425fbe5d752fdd SHA-1: 5ad460df578f4826310b34266d61dc51938603b4 SHA-256: 9176f0dbcfced5a3ee7eb32149cbd15dbfe83006a49580fb32ef4f9945525586
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to cleaning a carpet cleaner, which is highly unusual and likely a pretext to direct users to malicious websites. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=how+to+clean+a+vax+dual+power+carpet+cleaner+after+use PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/af9539943481b48044baae70e0d666da/lotoditelogiluditoxu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae6b0580b---43893642238.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8687d74f97fc24f7eb8e17b37620564c/berodefamodopegozekimox.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/posebibojemazugizibaroz.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zebevolepitabofatideromil.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/140853465e24a9ddf3045af2c5f0a691/35360997999.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9578d6e9e89a98cf2ae88e99702ddc28/22914908192.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/genufesefusimode.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffa80254d8---25146109983.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1bdb6b41---69249626671.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b904b6ef5e23ccabb062e968984508a9/jovuzazunupuvaza.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609303f638c94---viwabazesegibafalatusali.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096364b7ee4a---63891374263.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/49587223718.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/920eb0912f10901d3f0f2810217a7b83/samikunela.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd646a0bea---38162695092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 5328 bytes
SHA-256: 50f1dd57eec7b5e0507c007a6f1578fee1c2b4a8a6aa6829d3809a0dfc59746f
font_01_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 10664 bytes
SHA-256: 53e1342eb4d61ac1f4af28b2d34e3ea2e11c189ccc74f6c97c27193202c6590e