Malicious PDF — malware analysis report

Static analysis result for SHA-256 513b00afccf064a4…

MALICIOUS

PDF

74.3 KB Created: 2021-09-22 16:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f26371aa7e14cc622de3c1e027a0675 SHA-1: bea702489d88d2d61a341f93c766caa21e214c4b SHA-256: 513b00afccf064a45e392c2d4748c51a82f6e2f1f3a0742f1348c183e7aae737
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload directories further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=free+cable+tv+app+apk PDF link annotation
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81ae60464---61273703132.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142903406d21---jaluxukuvo.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/dedebexosamojisavitufixes.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/87134738578.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161362f6f568fa---89651210627.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/96381803881.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/derolowenewegagururuf.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/12030476897.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bizositerodegijorudiv.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/gixavifatewarolinepefa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b06778cbba---wunawuxabozixoxemugowofa.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/biwegipokifiniwujamamuf.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/20927617497.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa511bd90---94226951106.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/69361828334.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/busebuxopos.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/73749279642.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/16c03a4625189306ec82d500602f3097/xugibiribegerifijabevim.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/jewiwopibuzexumakiloxe.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/1322f1dc65dab7f483c9b89c128f7c23/50270094727.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16140f56a3ae90---nobesolasalejavasekurekel.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/73919635675.pdfIn PDF document text
    • 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_off0000c305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC305 16252 bytes
SHA-256: 2d314cf2224f3ff85183f32eaa8a61135a84e53d85d22055e8bcf16cb44ed1d6
font_01_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10156 bytes
SHA-256: bfd3e8ec88c55c0833618e05d5ca092860a649ff0970703d4c5f31f88bf62b8a