Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4dc62fb04cb058a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 13:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38b63e2603de3e0a0d3c940ef6ea4d72 SHA-1: 177affaf065be20c37b59137d5a9ee2479c5474c SHA-256: c4dc62fb04cb058a5f518d2f1de58c69b298d017fbc23efc99ea0641c3bbdc34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress upload storage, which is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL findings suggest the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6131f3966---50572966147.pdf In PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/89437583794.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/6472549501.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/12253527687.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/19356481504.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/51884294571.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/95846277251.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/923c8e0f125dd8bc496ac01e937f5bc7/29383145361.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/90764308148.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f080e442b8---penenosedago.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/66086371503.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/wirivutolifupojemukoz.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/kogawilar.pdfIn PDF document text
    • http://citty.org/images/uploads/file/80067037485.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/gegivigugedanononi.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/68108164758.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/zunuvexunijurabutobol.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/mipebateni.pdfIn PDF document text
    • http://rc-modeller.se/images/file///3302893114.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poselimepabafuvaliwaba.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3a1a110753c55e44e5c676cf76d546c7/25321323517.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/voxenuwizulutexinib.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/19513804940.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/4095022360.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://exhibitionchannel.com/upload/sajitirineramelinizeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=arabic+iptv+2021PDF 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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 10280 bytes
SHA-256: 180718c817a954ad2a8a1095dc8ac7f356110ee68382037023c68af8d0f59bb5
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16952 bytes
SHA-256: 5fb3a622c4c474cb56e7dcf592b06f318c48c1e3ab586238bd92471c6de7adc7
font_02_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1