Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72f51e1fa17a8d…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 20:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4dd26827ef23ecfe92bfc2d2718df8b3 SHA-1: db319973f6c572e1ea8fbf094b94bf2df0e1bb8a SHA-256: 8d72f51e1fa17a8d946bba59947ed90c80fb7f829e043797d215aff1a23b1e3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous disposable or compromised domains, designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to redirect users to potentially harmful sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://angkorphotographyguide.com/userfiles/file/vuvonakejet.pdf In PDF document text
    • http://imhome-listings.com/userfiles/files/wukevor.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/lasobuwububevaxox.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ae219cda---72118775763.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191709311584.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/setuzonasonurulikaso.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/33807528084.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/71297406873.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/tanujowesirutebiwax.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/51720043803.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/dedowo.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/zebogorat.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tmspt9jqj0hfi0gu999f8djr9k/tupipiriviporuzapo.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/ridipigofekuvakejufaf.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/35978674168.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/zimevegamufukoxatiwonux.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/revimonari.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/15343514102.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ff588513---pilimulabijizuxutufuxo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/21b879846a247f9ebaef7b99b58934b4/negetizakumogerikavexu.pdfIn PDF document text
    • http://vaithun.net/upload/files/48091849753.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/xadajilozirerusoxojifo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/derotele.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/226d1373654cb68454ff20a4224cba46/6350795453.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=iphone+11+pro+qr+codePDF 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_off0000bc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC26 16972 bytes
SHA-256: 5e61e22bbfcc6efa47b3e016628e0615c5d1ad75354967ffab0aa152596dace9
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10192 bytes
SHA-256: 0513d9b729951e3b0114d9965a04d9ea95616e3118e8b1817925035b134f8f5a