Malicious PDF — malware analysis report

Static analysis result for SHA-256 564380f0fc0ddd23…

MALICIOUS

PDF

73.1 KB Created: 2021-07-22 16:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9f77713ea0fc187a1346c29a55ea98dc SHA-1: 212bf2c5b7a28f10b627303652057794199afa85 SHA-256: 564380f0fc0ddd23f6a4bc5daaf272e766b3e92f90616151c65edddae958d1ee
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 compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of link farms on compromised CMS uploads is a common tactic for distributing malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://autothudo.vn/upload/fck/file/gelenefeniwizonevajowuza.pdf In PDF document text
    • https://nepalimodelagency.com/userfiles/file/59059052184.pdfIn PDF document text
    • https://btegypt.com/file/pofedefomepaloremofowobi.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/88822849321.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/15116344864.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dunifa.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/23120847507.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608266e1c59c4---zinibexesisubovazoka.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784da123073---kinifamagek.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wikokes.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/22800195061.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210717183234_etr0p6.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210714115830130.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/vemezaj.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/83f1kgvlpiqvp40qug5s3fo1bj/nuziwemofosexarowaxiref.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/kuwipajilijomeku.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/4b2cc5184710beb21baca3cc40042db2/4382508320.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a63a6800c---sorewujosotares.pdfIn PDF document text
    • http://ubest.ru/images/file/60546501112.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/52553117975.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/tegub.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f4b426649e3e84b907f801948f631025/joruradutunanovigar.pdfIn PDF document text
    • http://teraval.cz/res/file/87751075814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unblocked+games+bob+the+robberPDF 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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 14880 bytes
SHA-256: 489c81252535f95764ef80653b799b8c934e59ca17099d43573152a0ea06897f
font_01_sfnt_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10964 bytes
SHA-256: 9d5caaf2fe5053f8a3c43fb3e045bb88191b8a58007ce5be590068161fa2e79f
font_02_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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