Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbfacc6b3e75edfa…

MALICIOUS

PDF

196.5 KB Created: 2021-06-28 09:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 487f1f45568f78db7e84a0d7eca1a1b5 SHA-1: 0548e247cba6b83c4e153bb674bf99bf48e4f954 SHA-256: fbfacc6b3e75edfa4bc45018e23bccd457229c157bf38fd4ad5199f60d5e4fda
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload directories, indicating a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://299-45.com/CKEdit/upload/files/zilitixamepupamalebalavow.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dtn3896dhp1ksdoesaetj6eapu/4655042963.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5af493e170404362def452ee62746215/kawinilonelebawutatala.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeef7255fd---62877353604.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/47892061446.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8ae0eb7f03ae00a146b148c8c6cde0b7/dikoxogatekotomu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160826cc2aa880---41233584650.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/21014309616.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/83874831636.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3ca76dbe610131360c0e670b66cc348e/24065384056.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/53177137088.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4j416eo6e9cfqgqdsbctui8c72/97416662759.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e264e9daf3---17530951761.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d7506032655b73fee1a09cfd3193ccb3/5335412030.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c695b389f22---82971661195.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/bb75816ee9acbfe8cde1699e9d7f736e/79766126264.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/fffe02156120b4be574a5ed43d8eb5da/90369697528.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/xumon.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcece042db---fudevolilitunaz.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/19685539444.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///34574494762.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49732e3cf---pujagopukenewik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+does+the+sign+on+goku%27s+shirt+meanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000286fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x286FE 7172 bytes
SHA-256: 0c1edb082d200a00854efe7852e9278e75ad3a2a0ad07517a4fdaae31b2bcce2
font_01_sfnt_off0002a04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A04C 10868 bytes
SHA-256: 7a9b9223fdf0d5a8b7f40e65602dd40a7e81439ada895d65fc99cba4d9dd9684
font_02_sfnt_off0002b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B917 20556 bytes
SHA-256: b5ba25fda4a456c06a5c132e683e8ae8559123b9bb0317a5fd0f2518bb11ab3c
font_03_sfnt_off0002ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1