Malicious PDF — malware analysis report

Static analysis result for SHA-256 145c44f38c3d9c7f…

MALICIOUS

PDF

81.4 KB Created: 2021-10-04 14:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 022ac6c2cbcd9a029e7388a8f0700b2e SHA-1: 3e38755113534454e72828fc5055d4797b728792 SHA-256: 145c44f38c3d9c7fff80944f208a372663bc23be49216f6d2a3d0291f7da8a64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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
  • 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 https://cambodiadriverservice.com/userfiles/file/kawofinogoketagoxup.pdf In PDF document text
    • https://x-leather.com/radsportfiles/file/kiwozimidezaxesekeso.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/2953290933.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///galev.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/dekesibow.pdfIn PDF document text
    • http://ore-processing.ru/d/files/lirilanifonakotafipomez.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/43588563283.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613601a573d66---27892078477.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78b62c2e7---59466620171.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/nakotegevisusixu.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/pojizumuroxutadadenuliza.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/18569310466.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/91136881277.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/50441953002.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/talelokexitaxasebalug.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/polibe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7ccf1bc2---vamamuperefupikusuvelub.pdfIn PDF document text
    • http://josquin-capella.de/download/pedatu.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/vagijegofiganiba.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/86748107133.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/damixunawukirigas.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/62292620904.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/37571415228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=spelling+dictionary+book+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 2480 bytes
SHA-256: 8afa6d3d1b8150fa47f7af0bc79e0b45731cf3385cda1dd8ebe6d16763863fc9
font_01_sfnt_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 11048 bytes
SHA-256: 550cb537bf4bbc77d73e2cf6ab6b9019bef5e2c0e39f8b253957681a5e7a2fa8
font_03_sfnt_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 17984 bytes
SHA-256: 5eb0b9f2ea295a6f642a7cd9f0219c23a8552d3e333d24351cd798bf16b2e66e

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