Malicious PDF — malware analysis report

Static analysis result for SHA-256 0041ce86cdcdd31a…

MALICIOUS

PDF

363.9 KB Created: 2021-06-30 23:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3c86b0f2080940244be61094be8aac2d SHA-1: 85a993dadac41e4da6b029fc536084b59273dc20 SHA-256: 0041ce86cdcdd31a4d682afe01e3ebfca1b4b993f3d23b4c3446c16bb3c92025
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8709

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8758683e4---depoxijerivala.pdf In PDF document text
    • https://autosaloncenter.com/uploads/file/65843369812.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735ae66b614---koxetijo.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/e3hai58up5r3b2f20pniglphi1/66088558214.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/zedeberapaxotifelilepo.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-9/20210609042349581742.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608632b8ecea0---32178698596.pdfIn PDF document text
    • https://promise-land.com/upload/file/xijebafibadif.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16085767533247---nutejelefirigopesapul.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/934ab5023c8199720b1de8c0b7cf2240/tunujasunolokejina.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vodonuvesukikitemomovito.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/p66sg8d1sdso4ccvhmij9p0knb/88223191147.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ee39474c---49471670591.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/17626496993.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/87cee313415b4825e565f5c4c636c3b6/40817887977.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/petes.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46410af840---88044072813.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7c0c2f5d104107b10aa92f91043a26a7/92453845213.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/36365566547.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/46be159beec6ef9000984a2fd7336e76/kalakeravinolerizenarow.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc97a29614---10207788863.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab61c7c1cbb---30007703929.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4da5d5620---xadirubimedifeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=external+and+internal+intercostal+muscles+functionPDF 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_off00052585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52585 16100 bytes
SHA-256: 505f1f16fb057e2a34e7666bb0a43a50f2e0b7bc0033e59b70183295ac12d2e9
font_01_sfnt_off00053ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000552d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x552D3 20048 bytes
SHA-256: 20251f377e3ef3fc4feda9be6e8020de7ada527bf00f58d2c8f880898514b058
font_03_sfnt_off00058727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58727 10824 bytes
SHA-256: 2852aa28a80b14e4317c2728ff97160878b43f297b745825142ca05e1ec00edf