Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18143d67b3dc637…

MALICIOUS

PDF

88.7 KB Created: 2021-07-04 11:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3278422f10181521ebefc35f9a203108 SHA-1: 8cc578f9a431e7490dc72e6a8647da5d1f2e0582 SHA-256: f18143d67b3dc637866b464d4b4351ec797bb5ab0ae164206d07b0d482a3e4e5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs extracted from the document point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted, but the overall structure and URL analysis point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://gramercy-grand.ru/files/file/depep.pdf In PDF document text
    • http://locnuocvietmy.com/Images_upload/files/wikimewivu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/fh5hgk6l3sueta8j4eat519a91/31428493825.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f58082cba---90349075620.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/90894765953.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/724c11bf58908cf0ace61d6badeb3eaa/50760233452.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc08199c7c---47904403064.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4631aa3c7---16455723305.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ed6338b22c8fb6a4fa26b2b4e3816e0c/97167112533.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/jikarirobazupisopax.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd428b848d1---27167247494.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/870e1fd81ed0628ed7cabcf1e0466678/begudikimejotuk.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160828a5d1f60b---89232909576.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14ce0f533e6bbe54925feaabdc9eef29/26962424751.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/63969259704.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lpimrm6osl40pkoec6dahlskqf/90869462512.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/wenerorinawijiloxibezaz.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/725903e57c51b725db834216af975e22/5664706221.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/71436269625.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/1636164256.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/1f5a42007c0082698060152b245163f4/wakaguxivi.pdfIn PDF document text
    • http://classtool.info/upload/files/wivefazajolu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fugured.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fa4a61a6736c910323043746fbf448a3/5057239950.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/fipagugogivotuwub.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160756d80c6b97---33461128366.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27c8181ea---luboboxovebalorozowi.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/63818041dd4edb1465d9b934f7f1995b/dosodatigodujidexas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lucky+patcher+free+apkPDF 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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 28980 bytes
SHA-256: c4bae5c1c39bef1e27b786bd7f57d46ecad37a6abc81ef7ae0ad568cc97e4a0a
font_01_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 10312 bytes
SHA-256: a7e9b97ae9b8c936a3e6fb44d52a947e24cad273c25442a450e642d932e6e220
font_02_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1