Malicious PDF — malware analysis report

Static analysis result for SHA-256 b345dd8bb2885467…

MALICIOUS

PDF

88.8 KB Created: 2021-09-16 05:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b63f631f164e0afa706f063f407508c4 SHA-1: bfa462a6ecf005fc6304525a11848e61898a928a SHA-256: b345dd8bb28854678abddc88658d26df6e6006dd4da7fc41b2cb106c5a03a6ea
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://hanurichurch.org/ckfinder/userfiles/files/22446802993.pdf In PDF document text
    • http://dexgerm.com/data/file/userfiles/files/51011996997.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/jakunademiwovewipepan.pdfIn PDF document text
    • http://domosplast.hu/files/file/59600867362.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/74510784729.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/mitasevopopaxonax.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/detuxigegugamo.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/67430997971.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/medatanenetoz.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210904143125806914667.pdfIn PDF document text
    • http://taipeitccia.org/CKEdit/upload/files/bivelen.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/daa467992d9de736f7cebaabdc4fee93/wivada.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e80e22ef5d---lilujebu.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/jubaduxezozanemilegiwizo.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/042223226218.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/13687206873.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec94fc39aa---8422344679.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/juserufadedilifipuligilo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/22082516469.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/8843767246.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/jojepitimorelajinigeduno.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/905555412.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/tewilelawez.pdfIn PDF document text
    • https://teamcode.net/upload/files/44504794897.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109111658371038.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/betagekewilopov.pdfIn PDF document text
    • https://datenglagi.com/contents/files/fifosujawenojalolojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=midnight+club+la+remix+psp+isoPDF 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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 11296 bytes
SHA-256: 1de99395d58ef32e01a8142a89fc78c6af18829a3b8dfdd0ecb2c05aa8591fa4
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 23888 bytes
SHA-256: 1c8757c314685da75ba1f170e500c6a42706957125a7a4bb57d651436efce835
font_02_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 2160 bytes
SHA-256: ff71be3390770fc3df14b6d8e638ae7f64449c887d80c1b157299253b1b47972
font_03_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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