Malicious PDF — malware analysis report

Static analysis result for SHA-256 eafe75d507665cee…

MALICIOUS

PDF

86.7 KB Created: 2021-08-05 15:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b384113b1ae82701e230f5e40a07d649 SHA-1: 2c6edcea62fbeb82ac0a0462d8576805eb4aabb2 SHA-256: eafe75d507665ceeef0303d16a81564d37f1f5dfc09db383b1234a4d30a8b9fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest a tactic of using link farms to obscure the final destination, which is a common technique in spearphishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/moxomafopoviwurisefiref.pdf In PDF document text
    • http://tofuyatogo.com/uploads/files/wirisivu.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/lapozixusojigejis.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/suzojidof.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/losetosoba.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/76088175815.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/19p7gpus0s3inb8imfjh1kv05f/kokokupat.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/pijovimikazinepa.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/nlr0mk4uu7fu012pqosfh27ob6/nowivobisazononedazomup.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/18084180331.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d09310bc3---xunomimefizavegolixifusig.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vixozaverejixuzagonavoxup.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/61613273625.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007602e0a1---88448371022.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58a05bcf3---fuketadal.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d876d95cc0---9048428358.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ceecf6d9b89c9f9f5506d4730b634df6/71781843042.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//61951672807.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/firosa.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/54852844901.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/59337869520.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xogewulutusegasemaxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fundamentals+of+microfabrication+and+nanotechnology+third+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C7 11400 bytes
SHA-256: b0db71c8fdfb56d3bea01f8e2b29f07aa640049f8d6de3ffff01980944f80c40
font_01_sfnt_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 19572 bytes
SHA-256: b9c09f548ee661a47dbadffeab322420ec28423c2f45557e93ad3e7b067908ea
font_02_sfnt_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 16108 bytes
SHA-256: e76b5fe07ac7390949fcd2b4f145db97ac60e47f7b8aea51cf6de3fda4156bbd
font_03_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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