Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5d34d09d963053…

MALICIOUS

PDF

76.0 KB Created: 2021-06-26 01:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5769e207877b2678dedf0254a4ac818c SHA-1: a063b273550bce7ec5f55e2a2a53e099408720c4 SHA-256: 8b5d34d09d963053c89db29ca730d644d4a85ef45930f1714408a3d64a299d2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a trojan or phishing content. The presence of numerous links pointing to compromised WordPress upload directories and a fake download button lure suggests a phishing campaign. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ic0jdnj83d7ovbva3s514821ta/lifafedidivuvenefaxexo.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fo76ni6ngfe3l2s2l7m13i2f0e/1240675046.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/fve6s9pf7m7hc13mjl5fiu4opa/lasivulexalomifi.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dopasumeb.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/norirosu.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073830f77891---30063848515.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/tirerutotibitinizatasomeg.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jajakutadanorufigusobabu.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/bezugowujuputurexujaforex.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03cee7d12---304457144.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b05947c945e9148c19bb6c046dfb370c/roxulodezutapig.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/99573656012.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/57f20bc7225497f4f75f6b10d67e6de0/22412085588.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160802a52dabfe---relorewibowumegesufow.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/sius39tp2i10p3a6u9ri2ov7o5/pisadexitodawun.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/39258b46tiarg2lfmguc17luas/kokodolidixuxawere.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/31905664850.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116b6e9057---87894000976.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/wuvatumuxidetog.pdfIn PDF document text
    • https://guijek.com/userfiles/file/55848775405.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6169a102---45861534527.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8750fce641a0c2e5bbdf4f1dc3d3ecc/25977277245.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512030612807274.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/pedoxizukukoteseparepe.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5d02bfa98---78939397337.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ef2b6e8d---ribesosikutimamugemiz.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/75c33be49612ee67ae5ad6614e3fc6c5/81703377353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=face+off+2PDF 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_off0000cbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC2 15980 bytes
SHA-256: dc9fa1e97bc0d7ba2bad2b6c791a3fb98e79447198caa18d5183d2cad9c57f6a
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 9816 bytes
SHA-256: 7af6143b768f26ddbf94f94b7be92060c0da3fe93b3fbc768b00d9982169d8cd
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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