Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05fac531b5688ae…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 04:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eee74430bca5103242fe18b6d438a2b5 SHA-1: c17c26a1f1397938041b68f4b877d50298f1230b SHA-256: f05fac531b5688aea387eb06bbe32b802aa8b516f6e10e0f5511f4b6591e03cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are confirmed benign, are part of a larger pattern of redirection to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140f902ad55e---58142849958.pdf In PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/gagonesumekej.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/6659907483.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/jebapadalorasusudiruxeju.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/98783288935.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/koditotewejumobedubitono.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/viwedisipasarigadepu.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/14600409613.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pg5djqlose9scb365m1gnncsd7/wewugerosexo.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/buroxurutamuxurisobarofaz.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/duxewekurowokivaneb.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/19456619389.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/93826386974.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/94674729853.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/jakunubaxajarilimegu.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/28857352286.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136a80b3da2c---fekejemibusivozimifaxij.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/jafawilamopodenewemokuja.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/24729965944.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210914093848_bz4l7f.pdfIn PDF document text
    • http://polipack.ru/content/file/49013049754.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/bukekizog.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/77492622513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=note+9+exynos+gcamPDF 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_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 10696 bytes
SHA-256: b9d2808b908662b9eb6cedc55260e4f6bca952f8c2bbce2ef1cbf08e73cc5910
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 18300 bytes
SHA-256: 67d1bfad7d3322390bb319891b66a8e2e8c37fe4489ff77e7ad3df1653d08e45
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1