Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae91afb75f368c8…

MALICIOUS

PDF

93.0 KB Created: 2021-06-29 16:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d224e34c8565b45a16558ecf05c90ea2 SHA-1: c986b339a3ce089475d792b35d2b8dcfaa8ac2ae SHA-256: fae91afb75f368c88c405c1712ca0d4d89313bb8726250a9d5222bf7026732c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF link farm heuristics and the ClamAV detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ahchala.com/img/file/pofabutilewagubuvi.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607415d6b8389---46533565374.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7247f4f923059f36595a8549c6db35c7/mumerunereze.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a71bb7ec---57080740478.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///kaxoxijodovalanefuwixel.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/n9usrbhoomq423n1afol14chh5/26102682566.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/81465276696.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9480b0c88b---37427165822.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fitutifazigelinorakokel.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728ae1ed9e7---5996130727.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/fevexogo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/2f5401404e24ed934e91b5458cda7f48/67760251617.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608653c60dbfa---83952059203.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/93392554471.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mojuwevima.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/d463omk4iqekopu59i1pcqucam/61039043364.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/52270863073.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/gl6un97ag9bmssm27tlo3p5cos/23491097536.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210617_200640.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2939184ba3ec088fb06ce4114589f84c/vilafageremipuv.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3675b0565---fesolawejitimikozokuro.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610044523554.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66541cba7---tuxuwegowabane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=research+paper+related+to+kohlberg%27s+theoryPDF 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_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 17280 bytes
SHA-256: e5ec2e6c9c120630839ca6c6cb7fc7e2c48a114e5edbcf8c798816de796f2392
font_01_sfnt_off00013362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B79 11020 bytes
SHA-256: 8f727dc4aeb7a361aedbd1e80265f5e5160dba8139ed8d49489e072d78847657

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