Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a7e1914cfc9cac…

MALICIOUS

PDF

68.9 KB Created: 2021-09-04 22:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 833e3c920fda7a3d74e081bcf55269e3 SHA-1: c330aab7bcdfa54161275612cfeab8b120340896 SHA-256: c1a7e1914cfc9cac11baa35e994a2eab15547e1c61cf7a8582de352fc60d9fff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by heuristics like PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://halaljones.com/uploads/files/9968305456.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/63vik57s07joht3j7onhfm6ago/61350121414.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/dorisapamerif.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/79257079409.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d653f1d63---12006631721.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/51157942562.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a7486cd1e49365ad507c70088dad8379/41470114466.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/beketuravuxofimorupuvumel.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768a6da66f---95080034440.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/siboxifexenawigewigix.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/v31eu5hbunrs92oc2v9acul1qh/kanefos.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/bowefojujapiragibiw.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/mojewulusufojug.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/72611056817.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062002044282.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/80872175022.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/28082746207.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/30e1e2cd3ff283f2c0afb28885ac20be/xukabogologo.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/sevowavokotexulupujim.pdfIn PDF document text
    • https://highrise.pl/file/48479568166.pdfIn PDF document text
    • http://brlairport.com/images/file/47873994234.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/46430867998.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160956a7bb94ed---31988712385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=geno+grinder+manualPDF 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 15536 bytes
SHA-256: a2c2b90bd16f9bec1c48ed1cc264cb1345c0bdd7fa4057f41afc29943885c0f9
font_02_sfnt_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10464 bytes
SHA-256: 7be027a2021e27b086c7db22f0475f50faaf917b0851d4609c5b3d1ea6ee9dfb

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