Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f27450db98095d…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 09:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45d9674e59b5de94a38f9fe4ccdb7c56 SHA-1: 1502fff9e2a10b11274c8a12ee8bc73622a608bc SHA-256: f5f27450db98095dd017c9f5aff34e17d64ccbc44498c723726bcecfe654ca9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://younewstoday.com/task/userimages/file/76247391034.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nenagorebowafo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b91b3877089---96465858574.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c673700fc8---16238682181.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/640a1c13b4b3a37fe417af7f1d1f80fd/72005708827.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df53a005bb---93951097085.pdfIn PDF document text
    • https://trexanh.net/upload/files/69238692277.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/3irjvr91jr0l019qh976onql8p/sakavawumopixujisa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8s6hpnhmgdc8humrk2oqkanj8s/99062436228.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/zibotoxilisesikejat.pdfIn PDF document text
    • http://adveotec.com/img/file/sejudajegogofuzadakoto.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/rukitutigivigomusupat.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/ec8c51b4c025a51b32cb7c42183f4ad4/zulepiwozesoxupazami.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ae2254525---jovasutinuxibobojetaxuv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2331c80f0d99c81aae50546cae3f5274/20835636386.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/modovejomedekoregawasun.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/66774050384.pdfIn PDF document text
    • https://cecprint.com/images/file/fapovo.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/titejalapagipodaveta.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092339935384---nesun.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/fujejetewomexagusujofiguv.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa32894e9c---limomatotipuz.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/zegibenin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=animal+farm+as+a+political+satire+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_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10760 bytes
SHA-256: 2f99d6d0d3555a4b50e21f074ceffafc21bb6e3fcb8714d8ff3c35cb8eb46067
font_01_sfnt_off000110e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E8 17752 bytes
SHA-256: 165121402d02997413614771b1910f3b0e2f880abe250fc3b2dc3968f796b63a
font_02_sfnt_off00013f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1