Malicious PDF — malware analysis report

Static analysis result for SHA-256 8278d989db20b843…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 16:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39572edc1e6315f9e431fb14aea3fc77 SHA-1: 4ac02a6444f48acaf27c9089791ca523ad3dc693 SHA-256: 8278d989db20b84381cf36cdd813c963f44b2bac894ff1716aa0ac5e825c245b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tonycustomtailoring.com/nbloom/fckuploads/file/nivovevijibogaxilonasijap.pdf In PDF document text
    • http://kaupa.cz/userfiles/file/24984163691.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a51db5c2d45---34152533051.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/bojorevezenidilidaxe.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613175cecc535---lavale.pdfIn PDF document text
    • http://kite-surf.sk/files/18065989939.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/71657327100.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/xuvemuvetudirowedit.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d3b2b66e536fbfb5c28e373c1c143494/gatutewufizasosisotad.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/5467216325.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/12836815427.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/gefonubuwesu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/kilet.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/97387217328.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/lepugalakukowu.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/327756355.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/jiwimorowojatowa.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/70415185943.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/jokobi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb9a79471---tifurage.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/61375388580.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3771a438bdf1f3b40da3a8babbf08b47/50787039957.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b030efd1f3bac9c1fed1772ba02c529e/91989378779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=basic+spanish+phrases+worksheetPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 19932 bytes
SHA-256: 586853e4a3f4a14c046cdd103302b47b388f710c25b95e002f33e385e9c80027
font_01_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 10656 bytes
SHA-256: a4f637158aacd76fac2437eead75d3d7ee6fcc779db3489c6db71767687c56e4
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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