Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc6b1259aa5107c…

MALICIOUS

PDF

108.3 KB Created: 2021-08-07 02:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 436774c6ce78b86b27cb0d46e2504c46 SHA-1: 79474ecca2be2bc6fc5bf6dc42aab7852c7e2041 SHA-256: dfc6b1259aa5107c87b21b1396a90c2f974a63e2fdf5a6cec9060ad698dea045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to leverage SEO for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608009b51d2c2---vetaxenomobawaxubosifolow.pdf In PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2feac48ee---rekagitijuvinokatatenu.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/13667aa3a85bc4ca8871f5dffa9209bb/41414523078.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80d361faf---65388681457.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ab73a21ba9a---sakew.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/pajejabu.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/84136457139.pdfIn PDF document text
    • http://haphadoor.com/upload/files/7979633458.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/aibbp6eh869c0l8igka31ve3b8/92981604882.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4dc51f510---foxojatelazelibowim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad88f2419e---86278019073.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210806_3EA29EFF882A611C.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/63655256402.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f042ab96512e82bdfa823723f9cd5e71/juronez.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/97561837629.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/kajokavizivomejijobeti.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/70ba306557064513b64de347124c47a1/kanojito.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/22880042861.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b85fba9b60d19f6fedbcb581631fc248/51796575035.pdfIn PDF document text
    • http://placc.info/up_image/vusosuxorizojom.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa065131d0e---38758171990.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/508e6024b17f96e313764fd1cc17d048/xexunexizozatogof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=accounting+concepts+in+tamil+pdfPDF 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_off0001465a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465A 16808 bytes
SHA-256: e63709b1b977e6b4c7488cb689a97a9477d2c791108d5621012807511f35f095
font_01_sfnt_off000171a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A9 10944 bytes
SHA-256: b359ecdd7acbaf1e742e574f830d4cd50f0ac30f0f7dd798a5c58b107477fdf5
font_02_sfnt_off00018ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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