Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1afb50462fd6dc5…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 05:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22766874bc4ab2245e65859e2a2f74e7 SHA-1: f4ee2530cba3c33bdb80c5cecb3100649f36cc63 SHA-256: e1afb50462fd6dc5f96ce4161c7504f9ede4f4984400179fbb05c389be69c230
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The primary attack pattern involves directing users to external, potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a860c342---kudokevuxu.pdf In PDF document text
    • https://fq.ua/images/file/19976638385.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/zibixuvuzusovabe.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/44590692378.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/76068667990.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614693a376cf6---jijogowazawegusidizu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/danujawizopup.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b0b974b6---zixusuvuzafibonu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e120a90114---16921522902.pdfIn PDF document text
    • http://ore-processing.ru/d/files/68308183746.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/ligupogorow.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/24462019166.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/pifubopo.pdfIn PDF document text
    • http://mqskin.com/luutru/files/29650497469.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/89172069418.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/nesav.pdfIn PDF document text
    • https://arerp.kr/data/file///89218105818.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/67577884144.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/6245584748.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/76036910759.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/49571205207.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137028e3e52b---gawim.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/xefiw.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/67284958862.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/xaraboberutexivopirixaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+11+running+appsPDF 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_off0000bff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF4 16640 bytes
SHA-256: 00ac53cd7ff21749fd9902b1bc984507478b1e4a6ca6c335776fd1911f3294c0
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 10424 bytes
SHA-256: 77a0575a463ae9ce0f03cfa97884738ae59bb101dc797ee041ad654770e234d0
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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