Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc77af679771a59…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 00:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 25cc110a4382c03176a9bc0d8cfd6dcc SHA-1: fa74f2fd0b7630d87f3a3e7279d4040d77ccda31 SHA-256: cfc77af679771a596055f6c53ffbe2fd1e1ae285248fbbc0b6b6cc5b54e66aeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=pokemon+leaf+green+walkthrough+pdf PDF link annotation
    • http://tabouligrill.com/ckfinder/userfiles/files/febeperodu.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/33738599399.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/wabupid.pdfIn PDF document text
    • http://dongphat.net/upload/files/mozebetaka.pdfIn PDF document text
    • http://besteva.com/upload/files/fusuligavu.pdfIn PDF document text
    • http://a-pluset.com/userfiles/32914249853.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/24487507032.pdfIn PDF document text
    • https://o-dance.com/upload/files/fitopele.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944bb6f6c2---66568617906.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/20981205235.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/25239350897.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xumudezuwoxejulu.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/74002366830.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/9335868991.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xovitedo.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/28319695766.pdfIn PDF document text
    • http://opersan.com/file/rusajo.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/140862207.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/63786727612.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd2b695c3---xowilevubirasizixezosegin.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/68856983262.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614caad88fc8a---rumenexijinizakawaviwug.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/81230040422.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/mupul.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/kegogotagumosukov.pdfIn PDF document text
    • http://greenbelt.abwingsmd.com/uploads/files/85818950223.pdfIn PDF document text
    • 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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 16572 bytes
SHA-256: 3b2d1234fe9b52c0f577872e858a0ff3e9b7e3f24181aff364c3e948f7e1e988
font_02_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 10964 bytes
SHA-256: 095b13311d3fe4978ff9e2b225b04592ae4adadd04a51c688d7d0b97f9a00dc5

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