Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c5d27902239e91…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 20:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5be4ee99ba067bcb61768acea55d183 SHA-1: c566df3bc1e19c9e600228e2192f7bbb0db837be SHA-256: 09c5d27902239e91e6537fa0f49ddaeb2bfc5835f5dad565844bcdbd99deece0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be part of a link farm strategy. Several URLs are hosted on compromised WordPress sites or disposable domains, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=number+7+worksheet+for+kindergarten PDF link annotation
    • https://baxsporthorses.com/userfiles/file/duwesovaxogajakiji.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3314425c---46677251648.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b35dc7e7906cc4aa0e3e90f0f98eaa54/49368997515.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/gifopokaj.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/ripebuzirupozi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/32433780358.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/674311ce7dd9dcd2905f4ab888d00e13/kimumir.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e481281b970---wiroretuxaxuvitotuvinewa.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0b7c540---77359152997.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/towifoxebixifunimemiwex.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c3498e138e7ebc9040094d9be30059ef/14035627716.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1d19f1cf11991df3392c6b37f0ea140f/91953644959.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/tufugaja.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/52297913212.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/9bef8ad4e3afc3624720e465b8774255/nipofaregomufima.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/9474911555.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/guzamagetaluwelotiwewi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/soxepe.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/54231471737.pdfIn PDF document text
    • http://jaatkinson.com/userimages/14559063496.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612068f23680a---29928417789.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7f4a40e9567224f862cda031714ae346/33439199464.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/64383399856.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 11200 bytes
SHA-256: c13677cf98cba631bf8d4d74983a43a0c655a7d9c3e025464955217f26b60678
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2C 17540 bytes
SHA-256: 46cb9209d55f0ac0028aa4ffeca677b34508c553a2a4ffcbaf9bf97bc3bc8ff8

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