Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b2432e0472c7a8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 12:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45ace2d95573ec9d3656f9023ff446d7 SHA-1: 06ff0012a6eefd51ee365253f2d39acb58eb6c38 SHA-256: b0b2432e0472c7a87b7d8622d772b80b51afb85619dcbf251815f3df13f93969
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://phannhan.vn/files/usersfiles/files/54026885704.pdf In PDF document text
    • http://chi-kara.net/userfiles/file/sotiromixewir.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/92481280404.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/jazujonutubijujukegalegi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/govugebefita.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/brhgdbdg1us26jhd8kv5r9k64n/xurojodigusovividapufuris.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/zamaxoja.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/97060715439.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611820252d10e---fepawevonapemonup.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9ae6269ea42b1a5edb91b9e4a783392b/dodanudojo.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/gonusajatugegatafemupanar.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3438ad7c---nosadomutep.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/37539560004.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/nebagadorekubukebatag.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/tedizawulebikewifegawufa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c058ea837cd---wizozes.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a036358e4a4---wufizaluxeweg.pdfIn PDF document text
    • http://headrepublic.pl/images/files/54788233247.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xisogemokiwig.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad7eebc099---bagixinumatovufebez.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/foxetowudis.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/74895264699.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/barufuxerewuripejiwaridiw.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/vovukitopukipanugujej.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/vejokewaporixez.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/4bdb6cf77917550fe124fc2d9c4141c0/zivovozaguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=aluminum+die+casting+alloys+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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 17256 bytes
SHA-256: 8aedfe8f872995de02e5e6394dc8a30c52387bacaf99bcbe5903fe70c7f304a7
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 11056 bytes
SHA-256: 788737bf035f3d73f4c75e132e27804863e205886b8abc0914864026beb4cbc9

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