Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b056e40fce775d…

MALICIOUS

PDF

80.1 KB Created: 2021-10-05 05:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 62d2a0d45904a29af1cc061669699e5d SHA-1: 2748d09102f6735eaa9bbfcb5660827376d9dc09 SHA-256: c4b056e40fce775db6b9f7a349525c05ccb44a5f15e923ae7375f5c1bea94729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs suggest a tactic to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://bk-plus.at/userfiles/files/rilitisogut.pdf In PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/sozabokapasoru.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/94142518325.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/43667102325.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mbnvunp6falb155ml86rea59uv/14492736600.pdfIn PDF document text
    • http://ahchala.com/img/file/49395593559.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/biwexataxonulogaresuwu.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/gafelosexotijemeg.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e852f6001413ddd804faecba011dc762/bepogebofitunip.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/99192421351.pdfIn PDF document text
    • https://questyme.com/userfiles/file/10352011747.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/54039458744.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/83704518917.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/10078054406.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0252146001631134434.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba38dba85c---junuzikuxuka.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/ribajexadirosivol.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/949f39a1ee5e48633009e26e94192fa6/22729036202.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/29387494054.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/fuwudijewedewawasifelut.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/gaparus.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/9623311847.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/38804807323.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/lakegawufemen.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/bobaxaniritaxuxewanaru.pdfIn PDF document text
    • https://mauspro.net/upload/files/43767817710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+decrease+fortnite+pingPDF 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_off0000d473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10824 bytes
SHA-256: 71f371c0980062467325f4a608698134ffc8f8b01861b2c5a209852ea84b589f
font_02_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 17564 bytes
SHA-256: afdd95efab4c6d3c0e2572f5a52d6b7ecaf0dfd3c4d0079616837c596c1c8933

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