Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f15ae3dac3ddf4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c48f55563ad9bee8a27b9dd11e9e1f41 SHA-1: 5e051c7bd47e1c870322be03aa1134b9697ab6f8 SHA-256: 74f15ae3dac3ddf4874b75a57611edeaad693a3a08b72df1a82cc7416765c6a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The PDF structure itself is also noted for having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=chicago+statement+on+inerrancy+pdf PDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094368948a7b---jarijusukujilet.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210902_9748547FC8D8D74B.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a28d753e9ccd558f8bb9cedf5f3b6c11/7155806390.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c94eafc2ce1---52914764300.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/91839759616.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b29f3261---mixuvenewove.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vsknouc5loup30pca92lm323fj/98824030073.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e49ded38---59323409327.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/65262243262.pdfIn PDF document text
    • https://tipresentoio.it/images/file/golorujikusoror.pdfIn PDF document text
    • http://aven.su/userfiles/file/jodiwuvidinumoki.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac1c137ee---mewebuzujabibobegon.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/28564841160.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d21cb4d3f2b32c8a667d145f896eb4a2/pememib.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/25999667783.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/tipajowikumiwi.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f700c7522---bexuxurofo.pdfIn PDF document text
    • http://poiskvod.ru/images/file/ruvakak.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/63437664119.pdfIn PDF document text
    • http://jaika.in/images/documents/files/kukonidunixibimipo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609e273b92742---85714479502.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/pibonezuxi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a875ef6---69908204243.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/gefuxaketizikol.pdfIn PDF document text
    • 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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 11164 bytes
SHA-256: 1477700ab62fdee6fe934ffc22e99e6abba0150001e18ccce610a2426694e46b
font_02_sfnt_off0000faa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA8 17304 bytes
SHA-256: ca0b9f7cbe5bdf1653ddb50052e5ae57079902debab28f0a19f7270bb440b01c

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