Malicious PDF — malware analysis report

Static analysis result for SHA-256 975de47a681176c9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 15:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9416c17bccb44d4207a9831ad5173b1 SHA-1: 111c8336b7147b97c152a1007a293ffb06d22353 SHA-256: 975de47a681176c95fa07d9e423a9e56631f1f1b6815da3658457df43659e19d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of external URIs and compromised CMS upload links suggests the PDF is used to drive traffic to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=ocean+waves+live+wallpaper+download PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383031a4a2b---22208038050.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/widolexef.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/86289654122.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lagisinufatukawafo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pbdvtd0mqfctc5q7e852c33n0/37482234280.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/36587110055.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/64009393470.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/runodiwudoxufetuno.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/medekusetapatekipekokobi.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xamugugas.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109120358257388.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/nizuvivanamasidogitoves.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/96589110849.pdfIn PDF document text
    • https://12waktu.com/contents/files/nulewuxozuvugudibixobujuz.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/70046332522.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///virajajoginulagowigifefa.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/75760343321.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/35614256761.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/givekolozum.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/8353794806.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135434b00db8---perobijavig.pdfIn PDF document text
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/sajixusebofomuk.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/kekapasaxukirut.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/22645820303.pdfIn PDF document text
    • https://onecre.com/images/content/files/65002927951.pdfIn PDF document text
    • 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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10588 bytes
SHA-256: cee73d426e4959de5c6a9f27ff80ca1c96c159b837ca5ecbd85b827f6512cfaa
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 17996 bytes
SHA-256: e896af9333fc376429fc6c8e0d9d59ac1d7e19834ec624d3586ac0015ce8776c
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1