Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2e381a512b6a2d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-29 06:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f855b0d40ef85d1977e9984d1578b54 SHA-1: 985871628f5c2eceff8f3636b9ca6d165decc69e SHA-256: af2e381a512b6a2d36760cc1ad654ced2a29cda879d72f01903f42b0dc4b80d0
196 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, likely intended to trick users into downloading malware. The presence of 'LOLBin token sequence in document text' suggests an attempt to disguise malicious commands or URLs within the document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://allytemp.ru/uplcv?utm_term=apk+streaming+jav PDF link annotation
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9b1f0d67---64610501517.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/42887525411.pdfIn PDF document text
    • http://artdental.hu/editor_up/nebewalafotir.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/jofit.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136fd1cb9e34---gagiruje.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16152e264c7ff9---vujetekijiwegogunevubo.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/39116097457.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161382b502b3f5---49186359941.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/davekup.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc152829a7---3792733092.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0664143741e47977a841402d5da83ece/kipefilutaromakenat.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/jomod.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/33506851611.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/34619726890.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c1cec7409---89618395791.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/7553881873.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328c99e3c11---mobetobuvevu.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210913231500.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/kutuvuri.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/todilonume.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/11812294522.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/rimukupewanub.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/gutefuxotemowijozexulaxet.pdfIn PDF document text
    • http://realtor-madrid.cIn macro / runtime command snippet
    • 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_off0000b1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DA 10700 bytes
SHA-256: fde71f15c2759a9d5ff0bee450125bb82097a896d4d22ff1a14d33ae36acaf0f
font_01_sfnt_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 17708 bytes
SHA-256: 88b9ff7eb074eb07d0f33b767d46ddde7c43886fb18bafffdea25923f8768b42

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