Malicious PDF — malware analysis report

Static analysis result for SHA-256 3439f2bcc64df7d9…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 10:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fadc6f677d874a3d6f8e21b84e221020 SHA-1: ac8fab679b5614bf59c2f802f66d3e79d038295d SHA-256: 3439f2bcc64df7d974c0d53bd53443870b548bd54869921c29799a292023a3d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c0bdc4d0293e550af7fd822fdb963337/43981827459.pdf In PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/ludewuruf.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/25175571003.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/70129502115.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/bibowisamonazajivu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a386c3087c2---pokotojupivisopavip.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/db0c6a10ee4321b63b103f05df7a38ff/94991313157.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611498959ebb4---61841897700.pdfIn PDF document text
    • https://eternalbliss.net/file/revironajo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/kuvuvabunemulafil.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60EE1DF2A2148.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/44909590676.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/malokewukotevumosomoremi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xibekej.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/fufol.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8o14o4p16e0det18ofegsngtn6/45496801469.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/xinevemamupafokulu.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/82405879615.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210617_5a9bd.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/84949003825.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc605389cc---24469566086.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a6b4d1f28fcdd75ca207a984da830fe0/mexodetuni.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d45e5c27d---sapilajebuveta.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/78447081820.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/sazazokozipibotazigadugaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=assistant+manager+salaryPDF 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_off0000d45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45D 10428 bytes
SHA-256: 855b64c162c6ac37654fa8cc6d68e1ef2dfc393848f0b79ddb0e25e37ab380cd
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17784 bytes
SHA-256: 003d5cf5e4882b30aafea6690d5e57906f7849247eb94b402a06b3d5397cb849
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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