Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d1af5edc416704…

MALICIOUS

PDF

92.8 KB Created: 2021-09-04 22:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f8ec2266e9c07a6411626fb9880a38f SHA-1: 51c3499c5d69f02754c8ccd06dfd08a56640c6f7 SHA-256: c4d1af5edc41670480816a50c4f2ae37735b5ca59338e2a21ccf93d18dc3130c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eahs639j3fpd8m92sspp7q4ne1/gapufojuzefubinobalawexut.pdf In PDF document text
    • http://angelescare.com/userfiles/file/40395594761.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/3262393364.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/walasufad.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/91545144087.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/14015439606.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5487dbce---93231697065.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/sewobodikobepuj.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/86653176168.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/nc2vg87eac758ednujr1qhtc88/34175524306.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052321595154.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/bivixadivoximemak.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/98702198653.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/jadobewaposawokib.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/40342682459.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/81501460268.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/e8ih1c594047oqqnitu03pfn39/4382006654.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/87a697ed675a471cb41b0fa55c2ec6af/fixujidobukunipusizuduf.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b434bb058---rejobonaxuxevige.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d38cd2961d8d68aa50d679a5502af28/doguda.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/96198946145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gleichungen+aufstellen+textaufgaben+8+klasse+pdfPDF 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_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 11360 bytes
SHA-256: 63a75dd3af4bbcbca79257e76c7aba779b24f25180b6e4d420e26314f3393edf
font_01_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD6 20960 bytes
SHA-256: e719b4765c2090eb553b79617c3c2cb2f7e5de560d3da55a1860b21bebd64d88

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