Malicious PDF — malware analysis report

Static analysis result for SHA-256 820578f4c463adb4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 02:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e38285605e728a8a43da2fbae9e2dd2 SHA-1: a174bbeff877cbd172600961d60724acae61ffcd SHA-256: 820578f4c463adb41d9917569b77142665497c8cacef0f743b75474c0fcad998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5larr7lr12tqcm7ra10djnhtac/zozilumo.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133207585169---woburugawiwaba.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210911063131_k0oael.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/seruwe.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614731583da3c---fuxifakixus.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/pewukemiwexezaxunuwezez.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/nezugiwexulofe.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/26971326743.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/xobamiritipa.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pesuvukozowepigalos.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/1446459512.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/zetonavozulug.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/dejezavorokajepebafo.pdfIn PDF document text
    • http://normel.org/files/upload/file/zatetojasutudububenosuzun.pdfIn PDF document text
    • https://blokhol.com/upload/files/gopur.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/85132258763.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/udobug4jvbl936j26nm2iq9cgo/xalopavimorasivikariwi.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/jaxinotigaxamubapikigodun.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/190908451404.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/fidavufabazepopodab.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ca1a202e480124f4ce98f85bc0a406a/wilopukal.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/29771275980.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161388a7d16367---zexebafenorazekujopawajo.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614544ce8668f---78170734945.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kinipul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+ant+hal+service+in+androidPDF 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_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 10528 bytes
SHA-256: b8b0010a7480a84127d021689f2af3056530ec40340d553b01ceecfb153f7892
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 17576 bytes
SHA-256: 73bcd5391164787afe49fdd6800fa1da714a12481f97a6e61380cbd10ba90606
font_02_sfnt_off0001286b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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