Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bf5774ce22e533…

MALICIOUS

PDF

77.7 KB Created: 2021-07-30 17:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8bfe7769856ad540225b453d158fa1b1 SHA-1: 0ec64a70428bba22c10e0805baab4dfcc7758577 SHA-256: 66bf5774ce22e533f5b7855eea37a50acee8d272b11c82437bac65d8699462a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure that would typically leverage embedded JavaScript or other scripting to facilitate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9c151eis8et9es1t14k3acupr2/vomufiditulotajamika.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/19498423261.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/12646773986.pdfIn PDF document text
    • https://kristinanamaste.eu/files/biviwarew.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160811928865d0---94300786472.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/i4rgbujl70eh9td9k0ebl3dce4/boririluzanumubafiwu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/tuwibowopi.pdfIn PDF document text
    • http://kme-kme.cz/files/file/raxukigogogasevisorifu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/fbi17ejgfhki084l269sjs4qat/januvujekul.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/18975512889.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1077f70b5f4d2a146741beb217869ddd/nazezozo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/df37236e2e23402f531810725cb285e7/zivolafovogedilifirevuzam.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/46031175456.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/bagekamutipekuda.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d0069dc3d---poxoxizitakesevorile.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/jebobebab.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/60482174618.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/kjf8pe3m55pfov00akee743ltb/8412916004.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/cgudhbdedmk7qmmupil4soi5o5/72552238121.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/34c30602d599506a9919bc72726672c2/lejoripedibawed.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f27507053---89176343540.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/84944254563.pdfIn PDF document text
    • http://whitebearlakeclassof1970.com/clients/0/05/05755deafc47004aae723e515cf08a6f/File/zugafupupavosodomimofuvas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=spanish+dictionary+ebook+free+downloadPDF 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_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 11224 bytes
SHA-256: b650fe5d356e01d92ac2a833a2637ceb17b576f05919bec2e2f9e91e957727c9
font_02_sfnt_off0000ff57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF57 16260 bytes
SHA-256: d0b2cfdf121ce68c0fd1cd616f8f189a22dbad86276bac9eb1a5675c93ef9d91

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