Malicious PDF — malware analysis report

Static analysis result for SHA-256 878cb9814b61e751…

MALICIOUS

PDF

84.9 KB Created: 2021-07-05 03:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b6ffd70431688e570dd40323ab00d92 SHA-1: 72a7d2f6b9104dd35d9287f4cc8ec87198af8bc6 SHA-256: 878cb9814b61e751c27b0ecba6a15f3b33c3674b4380674858bfbb1292819288
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95' strongly suggests a phishing or trojanized document. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute links across various domains, likely for SEO manipulation or to obscure malicious destinations. No scripts were extracted, but the primary attack pattern involves luring users to external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2518

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 http://ecofincas.net/ckfinder/userfiles/files/wivurijire.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be89cf16eac---pujanifulalekovomidazur.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/18625380074.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14bd6eed6---kukitatapase.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/dorimesepabodomek.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/857779a33eb8017f3c9dad7a7ac92372/zadenosizorolinosa.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/timitepafekabovozizale.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/faxewomojuna.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/49396592092.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e625fdf88807bcbc9092e7749ac79738/80576426633.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d8d7d6657---tebamedikuzebovijavikimuw.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b0db127a---zajexesi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3522244790---89358767040.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tidepijogozewu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f152afc69e9e20e977979a12f4c16a0c/mokefukonobexix.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da02e4ab8---julojamodoluveke.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d097cb409---bajufu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/99f957ae94c25b79e148c71f59811c61/xukapekupapato.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754f61c2db9---89898318466.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607be975889df---62378595746.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe9b10311---40537690625.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a278c7459e9---girudaveb.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622123900.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/20f4c2ac8a0994785bc05c899dc14435/12584591463.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/fuwubib.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a18c39913---9731301405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bible+verses+about+helping+the+poorPDF link annotation
    • 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_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10892 bytes
SHA-256: 4753dacde71b8a9da884674a898ea7364904da8b54a487e7fd088f5da3858fb1
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16788 bytes
SHA-256: 83a9470f304e8d7b75020ab5dd66113c15cbf4b0eeb49173e1176d77cf00a050
font_02_sfnt_off00013638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.