Malicious PDF — malware analysis report

Static analysis result for SHA-256 26546c586bd0edea…

MALICIOUS

PDF

135.1 KB Created: 2021-10-07 09:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0115f0b4d5833f452827c6bd6d21d238 SHA-1: 60b4f2e1675e425ee96877df15ec2b9e26f278cf SHA-256: 26546c586bd0edea92ac4ffbf7289ec2524c950171cc02ee516f17d60a9de96c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.vikingmaterials.com/img/23099114508.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4pqam7khb4l0kd07kr9v4m4g9g/fizufulikigafap.pdfIn PDF document text
    • https://resicolor.com/upload/files/javetovasomilatije.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/11103186625.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/zatulo.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0c999fb84d956b18de152afe4909f930/xelepivodanikiru.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/87488736706.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/31673632043.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/xovigibegosizelo.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/loxumivukitipaguxizalop.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/at58st574nemsr9v8iscvm3urm/2373321004.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1d7d14494e061a2bd7f091c92762b131/jabiwetufo.pdfIn PDF document text
    • https://pisausakti.com/contents/files/nuzolumodijedo.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/volejujaguserinetazovenoz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0b1eb99895365dbf523d36d1f5fcd5f4/39472606301.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/pefegisakala.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/kijegor.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/71d9faqf04dlrudomjrs0nk842/wugafenefixiziramisu.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/bimemix.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/segifavobasej.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092904011939.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/gigoniwadedaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=strongholds+are+brokenPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/48161784959.pdfIn 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://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_off00019f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B73F 10744 bytes
SHA-256: b992113569dfe66035dc8e9a1b080d6c25ebfc405bf83f97979ba9969f859201
font_02_sfnt_off0001cf9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF9E 25104 bytes
SHA-256: 78dbd5370c1d793470914f7016bafbfb6b268af6499740320e43438a9ced474e

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