Malicious PDF — malware analysis report

Static analysis result for SHA-256 a570734489f201a9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 23:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc881b68d4f5515ed54dcebdf8f8e335 SHA-1: 131e4592282f62fcc97e458aad3954ca84a45932 SHA-256: a570734489f201a9d196ee66dd198e5f72b21ddb2c3902ed2ae2b716a87b1c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term=reset+and+restore+android+phone' in one URL indicates a potential lure for credential harvesting or further exploitation.

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 https://catamma.ru/uplcv?utm_term=reset+and+restore+android+phone PDF link annotation
    • https://bursakaynak.net/userfiles/file/zefonaxazalodone.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/rapuvijidujafiwekula.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/f5k0or6kti3bvb0h6flc64bihb/zubijejifufusufofuf.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/33827050784.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/gukilizebazovevotute.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/fezunegapozikodomezebizuw.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/vamuvetadowaxipot.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/mufufumor.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/nolawobexujefubadovuwozu.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/91992373619.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/65131879084.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/85485957661.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/tuzumuga.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/rikegorewi.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/96186904380.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/35265231731.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/jawokusujabem.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130115747e5f---xasago.pdfIn PDF document text
    • http://klinok-saintp.ru/files/menisago.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6102307e---vezegemizujedoneladefe.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134c081df10a---51225602518.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/67056856763.pdfIn PDF document text
    • http://surtek.biz/image/files/20150318_023638.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/20288991849.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/kuxugi.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_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 17620 bytes
SHA-256: 2df507f55bc361c6fd6ffcfa50d4ade681f17f59475148bc041cec2d2dd9c44b
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 10488 bytes
SHA-256: da1e8dc25dab82cc25092ecf85f78bc1bb264a20bc6a277b1ddd394faef10c46

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