Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7232981ebee9b0c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-08 13:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a5028ecdf19fb4017fc7f4c0d31d0ff SHA-1: 295c59e2d26ebf9513a7a59b9914540e6dbe7cec SHA-256: f7232981ebee9b0c61bec0ca7a3d02789d7ac2334452942277b0742e53e57349
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards a phishing attack vector.

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 http://ausafe.net/images/art/files/36650673839.pdf In PDF document text
    • http://beerskiboot.de/img/upload/file/karevike.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161306574a991d---raxereroxosonufute.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161320e00b0230---dakevivamaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313a06c9591---55114772589.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/6335014430.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/57745176297.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/55350812652.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/66521740286.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/85597340103.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/gitebedewuk.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/wusuzevizaruwek.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/rotikegob.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/43971493586.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/25382795583.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/55355984401.pdfIn PDF document text
    • https://atiksigorta.com/files/28685933688.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rm2pl6pfrt84rplun8pild42mc/gujagawofapakogi.pdfIn PDF document text
    • https://avflash.nl/upload/files/nanowebizixisazo.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/lapupabimisuwipo.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bajemikosubusobi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/9730963756.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/metanowafejusuniwediri.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/dumokufokugi.pdfIn PDF document text
    • http://jadeite.ru/images/file/36775064177.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161387bb4cca9e---1648638251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rgp+contact+lens+fitting+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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 10740 bytes
SHA-256: 7ebfdd7a48650e51c6282db772a0c18fb89233d743c94d55f139b049c0a7a746
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 18448 bytes
SHA-256: 53a7a69471794e16f8b452495b7cfc85706fba77d7900acdcab1a4c13c9b60dd