Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf89f70c37071b0f…

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 00:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4c4931139766b7bc14db0d14546d724 SHA-1: 582b5fba40595da772b5a28990669b0ba4eda67e SHA-256: bf89f70c37071b0f94629d5db934e9187b39b43c07d4c8c82754d697268be4d8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on potentially compromised or disposable infrastructure, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fairway.cc/images/blog//file/47591356881.pdf In PDF document text
    • http://vigova.com/Images_upload/files/48043146918.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kagagidipawa.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/wixadaxuvawavipugo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f0d66d635---nobobadifawo.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/54605553041.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/81852344706.pdfIn PDF document text
    • https://kartplast.com/resimler/files/68461204193.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/7556507518.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/79383348155.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/wuwovudupovoritomabavak.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e152fb36---92873129286.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/21365328690.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210621120856.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/80755869324.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce307715a60---nuvaderiguwuke.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/3752064907.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/lamonujunosowoj.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/36419170498.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/zukafiwuni.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/11089301326.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/9245092817.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/nhnt4u2n443981lsif7bni2r3r/gusalomodegulozirofakev.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/68d4f8ea3737ae1c08b0b293fed61bdf/48587023638.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/jejilodupip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=estructura+de+lewis+ejemplos+enlace+ionicoPDF 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_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10972 bytes
SHA-256: 7ebb640aaa3c53aae674d2228478719486d54856787aab07db521bc213e49125
font_01_sfnt_off00010091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A3 17836 bytes
SHA-256: a64c9fd949a1b42bb3cb276bc36bc93e97189fa4d5be12a06ccf2dda237de5d1