Malicious PDF — malware analysis report

Static analysis result for SHA-256 2509dacccc658e46…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 11:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ec5cd9e7c02dbe38573b970a9dfb5d0 SHA-1: 14172ce1598029985bc40189d79a5e0ad6d199c2 SHA-256: 2509dacccc658e4606fbdfe3868db45a5f4da5931d4c92aae555c50e52bda792
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a fake CAPTCHA prompt, a common social engineering technique to trick users into executing further malicious actions. The document also hosts numerous links to other PDF files, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm or redirection infrastructure for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://huntic.ru/uplcv?utm_term=download+dragon+ball+xenoverse+2+apk
    • https://gencerenerji.com/resimler/files/21367891535.pdf
    • http://surmounttravel.com/userfiles/files/11918276256.pdf
    • http://ccshecea.org/upload/files/godukasojubutubuzuvidited.pdf
    • https://thucphamtruongxanh.com/Upload/files/juparaxuluvunap.pdf
    • http://licausi.it/userfiles/files/fopuxoluwurisapubetot.pdf
    • http://finemetal-cn.com/upload/files/vimeve.pdf
    • https://toocapen.com/files/soneg.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/lokaborisemusilofu.pdf
    • http://zjqzzx.com/uploadfile/file/2021092011294273499.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398c3e868---vinizegolif.pdf
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/32293055309.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c6d30b3bf---39883273192.pdf
    • http://vonschickenfremont.com/uploads/files/laradegamu.pdf
    • http://eva.am/files/614c81610a4c0406.pdf
    • https://davnosti.ru/upload/73577828513.pdf
    • http://barcabianca.eu/upload/file/30386247844.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6695d2dcc---19623159235.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/ee10547bcebf9a785184cdb83e7d5429/retaxof.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/xetam.pdf
    • http://cee1968.com/ckfinder/userfiles/files/26746293016.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/23d816d3375839342b1db89fb62375d4/50407492798.pdf
    • https://corcreation.twbiz.me/data/fckeditor/files/20210904_062737.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/39070233210.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161409d433258c---riranomilabubepebopiseni.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 16792 bytes
font_01_sfnt_off0000f788.bin
fc13bf48b18e2af9e9d3b9397f2a08e7abcc96f03e2ebc958d2f960871985e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 10984 bytes
font_02_sfnt_off000110e2.bin
f1a359743794e8e237dba9984945e97304d89a1b80d29293fe7f510fa95de54a
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E2 17672 bytes