Malicious PDF — malware analysis report

Static analysis result for SHA-256 4687a3f16bae335f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 08:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12d2b0a4a7fb035875b97201b5eb3518 SHA-1: e73b981fe653422c22825fd584e07b93504904a4 SHA-256: 4687a3f16bae335f60bf92a0e89a83697bf6d8d983f52fa30bef98f0c6ced525
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic suggests a potential phishing pretext, while the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm its malicious nature. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907195418309819.pdf In PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ferekeka.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/75879229792.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/72889411232.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89001811073.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/12051961330.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/romagixusotonemi.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/giriwimopazisukazaxojaje.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210906015745.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/77a244549faeaf70b96440fbe19c983d/25150326860.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/85706530832.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/jakiwozilevimo.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/50686052131.pdfIn PDF document text
    • https://pecsikult.hu/files/file/92893742156.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c900a9a3d4e5dcb781b8b2580a2c31c5/20119087395.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613679c68582b---71508298909.pdfIn PDF document text
    • https://betsin.org/userfiles/files/vugilunibetemodezamese.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/59054700390.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090516244373499.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/mowaxokileniberu.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/rixozo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa0c7e569---lenudiwali.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/1095619947.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/82427375806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+tattooist+of+auschwitz+pdf+freePDF link annotation
    • 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 18696 bytes
SHA-256: 4145e763ad5526a1064fb05cc726af39b75da779a4c01812579ed28fefe1364e
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10776 bytes
SHA-256: 79862dc37cd6c59ab716a302d48822a9b1b6380bc959327bfe594534af1d278a

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