Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bfba286416b5f2…

MALICIOUS

PDF

83.3 KB Created: 2021-08-19 05:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a16772ec9de1d94bd7c5175df41d0d28 SHA-1: aa6e04b9108abcf81875d110fdddc5e1ab940341 SHA-256: 75bfba286416b5f22756e4ebe1671a5dc3be5c40296a28bef555ea6ba9c7e3cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised CMS uploads. This structure is indicative of a phishing or malware distribution campaign, where the initial PDF serves as a lure to access further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/f0d7a5d1cc914f068025be38051d18fb/gidoratiwopazi.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/naresugipeniduxuzuga.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3faf744aa---gererekipabawovesago.pdfIn PDF document text
    • https://cafe-malaysia.com/contents/file/72675164380.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/90424681363.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/sdm8nn1ecv7f9ntn23pi3ntovb/dadirubazapusuvurul.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/dasuloniwu.pdfIn PDF document text
    • http://www.pilartangguh.com/file/4544707533.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/50200921912.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10bf9bb7a1---dofobusirixolafamaw.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c57d04ee21---85895876278.pdfIn PDF document text
    • http://1careglobal.com/upload/files/52725992115.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/82812800075.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/budelowavatu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/virojanofagupixosa.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3n4jj8b3q62qn4tru90cr61vq4/xirixojoniwudukowanile.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/kagenozajede.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f76031158f9---xagawabupu.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/44767962878.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/kemopivivil.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/3b8n96l5jmeamfg12ja1o9ugdq/wesonirobaxi.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f48265b0456---zejetizowogezezek.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1a0102543bc654b07dddb71bf9266ae3/2582007040.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0f2096827---gusosoten.pdfIn PDF document text
    • https://polandpools.com/contents//files/91700027071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aplicaci%C3%B3n+de+integrales+dobles+en+la+vida+cotidianaPDF 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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 18340 bytes
SHA-256: f2a7b302c20fc733f95afa304b223dcefb0e73c3bae83666e7d4162005f76ea6
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 11012 bytes
SHA-256: c26be6049c952b7fe38db3ede5c70aadcad6dde739b0b309e1276e713eff6bb7

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