Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd22ca3c0da0155…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 11:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6bde013ed0672134b843858832907b3b SHA-1: f3d04045088c9f9854fa9b74dfc8c2a35796266c SHA-256: 3bd22ca3c0da01555ad2d9a537edcb22ab4b075cd1f11bd4fc7beab9a68fe4e6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress installations or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://art4you.sk/editor_uploads/system/files/buxelivafobikidaxu.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc6b7c80a---34884559468.pdfPDF link annotation
    • http://ipublicity.cz/data/file/puxidarenufutebilus.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/2hne2nttdhcd3btnjqf514ubc6/80321982059.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609099bd387ac---5767231028.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/utqtchdiotktpo0puqnc7pkutk/ruderuzinujanopus.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/duvevisizerilufef.pdfIn PDF document text
    • http://alaskacounseling.org/clients/8/87/870ae3779d21e956d596131c1dd113ff/File/jowiwuri.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f02af7ed876---tizijeferesupodosabajine.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xegog.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/29563134746.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607506048dd24---94525714352.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/68474386863.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/46f411d8e6563a06bd1ce317005fa05f/lakufopigewekerak.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/zenubapunukuruvikasuv.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132734283e3d---54864564933.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b8db5f2864---mobikotubefemalob.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/42655418052.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/61718366790.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021043004120418.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93f575dc65---45184391097.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/sogirupimi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4f252df16ee26255e5ba1326a9f26bee/66531358891.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/45bsthcsdm5dr9at1aoqa857p1/74932186303.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/wedudulopulumalobo.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/koxiwixeginisugunesota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=family+tree+activity+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 16980 bytes
SHA-256: eb3dcf1a04d505b7976b9dd2e3105341bac03650cc05044926e2603d3e162bff
font_01_sfnt_off000113c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C3 10728 bytes
SHA-256: 8d2317ff1f618d4b9d5813cb7ad3c539b8239ffa9d1bd4e91dc0e6ccf3765dd5
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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