Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9a32ca37508a86…

MALICIOUS

PDF

94.7 KB Created: 2021-07-03 15:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c68e177f059e0bd44b69dfdea6514a43 SHA-1: bede95b153f7cfc54904743c3f09ef9f5c0f9fa7 SHA-256: 4e9a32ca37508a862689503f4d04fa57b8e7212d6ad14d74a8eadcc10a916b4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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 https://ivanda-commerce.hr/userfiles/file/tejosunibevexinukesakam.pdf In PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/ramanadorekovifim.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/valuvolewufipoloruxivo.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/90412717307.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfac80cb270---61444669053.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/pobamumaj.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/gixudipujilipepisizapuf.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fc44bf4a424996f807e4c39b3382fde/47599996329.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/906917c0a3049744e2058872aaf5eb0d/67692004519.pdfIn PDF document text
    • https://mollis.rs//files/pavaxevorumuguxizu.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1fa43221---33761907133.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/72151462725.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdcaec3e4---79000090798.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/kfsg86t8vttf5vc4efpe4n7f25/lebizufimeta.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/98151567590.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/68213fa9d5729bfd20df40f7328b2ed6/18489937428.pdfIn PDF document text
    • https://educhina.mn/editor/files/88345419031.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/xonewitoluxebomixa.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/witipaboneredap.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/juxevesib.pdfIn PDF document text
    • https://austarpharma.com/upload/files/33396713836.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/69700059143.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/lipulevadabefavilegalilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=quadratic+equation+in+word+problemsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 11208 bytes
SHA-256: 595c3b0984f8dab3de2e334c679664209535876556bf28e9d99a7c369da7b511
font_03_sfnt_off00013d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D29 17952 bytes
SHA-256: 13e0996b5f59a028e68732a7bae045dfd8ac46858a7cdf0fd070a056cf9f94f6

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