Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5b74a68cfa5f3b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-02 07:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c58a26dce0f16af53f27049ffcd8f83e SHA-1: 84aff74f3fbe621afda7c860e22198740b249ea6 SHA-256: 9b5b74a68cfa5f3b23f30c9a878549c8d6ae43fd95e11ef777c716341e9e6873
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and distribute malicious links across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ad72a539e68c2f8020d9850802919281/9664183779.pdf In PDF document text
    • http://houselandia.ru/files/tutadurigejukunolegateva.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f7b5c3ccf7f---tiberajoganidoxolirovajag.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/63709513763.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c773a70167d---41631349274.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/32339264375.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/7899923067.pdfIn PDF document text
    • http://berbun.com/user_img/file/66683889987.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/zuligum.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/61345867925.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/83047297436.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b70978209e65a56ab04cf153d75652d1/20035937365.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jubkg52gtvshv8grvq0dc94qs7/gujuzuforet.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d09c01d---22786118544.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/bawidopakedajad.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/lakol.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/nusuziwolomusibururumaw.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/35176521231.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53a927e93---nenajevosiso.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/kevegogonokugubikiza.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/wexujero.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160852fa9df6b1---xiluzolip.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/fitovedexifam.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/16851904513.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5245bb9e5b---tovefezisamenutonaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=most+famous+folk+songsPDF 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_off0000b81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81A 15492 bytes
SHA-256: 60b5d8e2334845826dcf1776a12c1df6460c970ca564ecce5f470e20e4cfc7a9
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10420 bytes
SHA-256: 857143e821b2d7e8e7c917c7acab7715109b24a0bdff9087955df56312e310e3

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