Malicious PDF — malware analysis report

Static analysis result for SHA-256 f803abcda71bfdbf…

MALICIOUS

PDF

164.1 KB Created: 2021-08-04 01:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8afc45d43f17f29ee67af006aa91cceb SHA-1: 0f25da3cace1071a09886df84aa723ab796525f5 SHA-256: f803abcda71bfdbfc2e2d54092f2549e4a1f1648c4f89a0d0a55305ac242a3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9522

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 http://dianacb.cz/userfiles/file/55437379647.pdf In PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/39526525092.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/93422987926.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fc3ea3fdd---10600629101.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/damifaraguzivuzaveli.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6588f0bfcd---58287956094.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b882b767102---79901856207.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/kimepaten.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077043729846---sulevilogowojezarug.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d622db31---3859866224.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/20060275307.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca56728109---82068962445.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44609cc2d9---kiwosofirazofipo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e3461fb9---vudapumetuxaworutaw.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709bdb65b8a---18401841287.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lazirugalubarawabibeg.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/kukovale.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e58ca5c6---62865956569.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091767156a78---67444996123.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/85186584378.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/1625511658383.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0f0746f8d---nixonatirabusurirasirez.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/92851980010.pdfIn PDF document text
    • https://x-software.cz/data/file/xepuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=contract+for+sale+of+land+nsw+2017+templatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000206bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x206BD 19232 bytes
SHA-256: 7c20c6f75b024c7393bfbb71e9a7a79873798027a91353d47a9b1922b57c590d
font_01_sfnt_off000238e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000250f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250F8 11148 bytes
SHA-256: f018896db61075182020224e05a7e0b20cd4cbb8e64b8a2ee40129149d49c582
font_03_sfnt_off00026b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B46 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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