Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059518053f6a435…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 15:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4bf9d2b6c858e20b70a6bb6d6e64ef7 SHA-1: 5fbdc04f3894bc293c22b3719bb26b3fada6e67d SHA-256: 1059518053f6a435998bae29c8522242aca5b45b57d31551559f2329a3e57429
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which host further PDF files. This structure is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/568199e181643b11f077513c34a93a56/xuferomemafu.pdf In PDF document text
    • http://zagazzo.com/userfiles/file/99796976827.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ku3mukad4pq9o26nl8pudcdac1/2644022832.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kovajuropiwezuvalafor.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/mokufu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c0e5f917ff7848ddee566750b532bc39/bibimedakomobe.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/350943509611b8e19224a5.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/fiwopoxowuja.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/960f39f6a1227895119adc70f3f08d0b/7530087751.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sq9v13qm2e1l01m9k0klcgd48k/relonataganisuzomozedapuv.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/kebetapezodosikuxit.pdfIn PDF document text
    • https://tangentemag.com/img/file/96322568307.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/rimasagujikunutogeludap.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/85636661751.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/60022643941.pdfIn PDF document text
    • https://giustofiori.it/file/62206935762.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/274753b08d807a22bfe1365bc7617d19/43816910190.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/66f3a420f464a6eed66e765174ccd9e6/3421689436.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed46c4587b9---nipib.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d7404269aea1ab88070957ddbdbd3564/32258981290.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086afef21caf---bilofikefined.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/75796554457.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/moxidurudexupa.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zuwedidop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=1st+and+second+conditional+exercises+pdfPDF 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_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A5 17752 bytes
SHA-256: 0b138d64e69c9efe92a0e2553c997e5a5cd870c94f177bce878db9c16e863c38
font_02_sfnt_off000124d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D7 10668 bytes
SHA-256: f2be7fe57f636e04429ca9b50ce7186a06e4b5bfbf2cb6d151c7c3fcbc5d545a