Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8025284d1dd3a5e…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 15:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03e9e622ba7bf18ea7d04b4531cf9353 SHA-1: d268ea485849127e5016c8e96b30fd3969f69a02 SHA-256: c8025284d1dd3a5ee3cca9d8c2cd1761a8bbd43e09fdfd15ed4efdd2dbf43f89
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites and disposable domains. The presence of urgency language suggests a social engineering tactic to prompt immediate user interaction with the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://robedecreateur.com/img/files/bogaj.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/78472046487.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/zomarodiremimojisexibubot.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/94828d62a223dc8a3bb466f5dc3002c4/2972518375.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5164e4b72d---zogame.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cece6a942f9---mizurozazidosibe.pdfIn PDF document text
    • https://wrd13.com/force/file/jekagodoke.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3826141b1da570c02d29feca2c0882a9/polumedigavogeja.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b257bf1b090---5967686783.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/bajibebawofapuxuxivegi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c785d4ca24a---kodalonijaresefefima.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/a9f9a2de141155a7e740c0d204d25fd0/fiwabeni.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/26295699115.pdfIn PDF document text
    • https://jagominum.com/contents//files/dufakasufugomi.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/patoleg.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/tonuloropopazivawaja.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/gerulexikakon.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79bbb75c4---79206414472.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/betufudexo.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16082d13b1fd47---93860247665.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/tazasotilunipuxefa.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/nesuwofakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+tubi+tv+app+workPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210707/16256632723756.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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10708 bytes
SHA-256: ed41c22618ba0cad9ec12a107f6f91852272b3644772bda95144fd8d41698a42
font_01_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 17304 bytes
SHA-256: 6506dfd70a6307ada79d031f32b34ad64dfc94f97c082bf2f9f2fa722f42c25d
font_02_sfnt_off0001421d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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