Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b96a39d2907fd4d…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 09:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 524ee96f3acc7417ecca9aa02302dd7c SHA-1: 766f731c8fdcda43b78b4a66435f66b110d2df39 SHA-256: 2b96a39d2907fd4dbdd2d9d7a4a985a930fa7788cb0d9a2e9d98dc1a77854a52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads, suggesting an attempt to host or distribute malicious files. The presence of multiple unknown URLs hosted on potentially compromised sites reinforces the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5d64366d---61490760106.pdf In PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/43697985327.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/18562516758.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e027b840---26196169697.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405481ea3f---desobigog.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570f3c268---wigelaxijubiviket.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/luxunipazorax.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608121152080c---xalutupizatumiwotoj.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4946cae21644d6a4d1580439d2f2672d/kufonev.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb8d16f88---6245964386.pdfIn PDF document text
    • http://aimic.com/userfiles/file/46800646223.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/30223880709.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7aba5902ba88dea68e7e4f07fd2b380e/dabasux.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/mowok.pdfIn PDF document text
    • http://peak-experience-japan.com/vofud.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/83463206811.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/42421044261.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7cbdac6cf0cab0b85c3464ec6a49c1c2/wiratisitulogalu.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/nilafawixuzilo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/sudujimagejiruzix.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rofus.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/lijolifewirik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pledge+of+allegiance+meaning+worksheetPDF 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_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 11104 bytes
SHA-256: b39d8d520373f53d08ee4453d427a00eeacf6f227f9e336c478c35b1ee98c4df
font_01_sfnt_off0000f0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A4 17100 bytes
SHA-256: e3457e22f2671961de7f8c4d47eba0ce9c4f6129e98cfe5bf5c63a055a5e278c
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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