Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075ff57e1d0267c…

MALICIOUS

PDF

86.3 KB Created: 2021-07-24 05:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bbf7d19bc5008c603c048e9be7ba259 SHA-1: 3607b75ec0150d9e74f9c3dea8e11e368839b533 SHA-256: f075ff57e1d0267c461f09a4eba01069e48ececaccb7b6a54f75604814dfd11c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://natproperty.com/userfiles/files/63230173748.pdf In PDF document text
    • http://longthinhphat.net/uploads/files/27150721715.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/70859658924.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/84124945024.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/da6abb90c26147a0c82e996a5ec12e7b/42875649123.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160988a24b4c17---vives.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b24edcd78f686f6814acfd8fbc2c6685/botipisolu.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/pujis.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ac8t68pvg0q1ad4h9louei27n3/basedimevewiwuwudinuwutaj.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/siwefex.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e16c36de510---22619962645.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141010304026.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ca82b3d1---41587296743.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f62e4204438f50777ddce88072f910bf/7692332777.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/nuputurel.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/555f5750f69d5d93439dc08f1a894e3f/tagagenedijujotinabuf.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d9480d2bb56823f09b4e81df45d7c58d/37163869624.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/zunerijudimavenafet.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/amfrjnojr5nspmbsejlefavdqu/91028878599.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/26480127538.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/37041540397.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/87872194791.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/9a0ec332a9da868c05538bdb75df4d65/gabewej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tarih+y%C3%BCksek+lisans+tez+savunma+sunumu+%C3%B6rne%C4%9Fi+pptPDF 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_off0000e914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE914 18004 bytes
SHA-256: 0a5acd2a2b019717494083ae6d772156f8804b818f0d7a42a6d5fbff5ce77de7
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 11432 bytes
SHA-256: bf7de64e4ca84d3947d4c5a4ba417fbcf1b2e1e1be57a0b6ce853f0967cdc1b4
font_02_sfnt_off00012fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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