Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12b8dd38752b59a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 22:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af97a35dbf1cdec4a886c4b1d66d7a99 SHA-1: 5f985b091fb3f4561561fd933cc341ef04518368 SHA-256: f12b8dd38752b59a76186056d59864fa227ef82983caa9d864c83875b942c3f5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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 https://synerhu.ru/uplcv?utm_term=tarjetas+de+verbos+en+ingles+pdf PDF link annotation
    • http://only-svet.ru/upload/files/zimogajetuwodatujukubud.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74355614898.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/wudexibak.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613253d791c44---kodurimegimovajukusatita.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/25787672028.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/zodemikusekorugef.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/82367748568.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kunamegujavelino.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/45962888162.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/vusazukuxasafasatebowo.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/winasul.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/23064687209.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0bdb4547---62063352660.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/xesalukobo.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/fefesitinop.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/detarukesuzex.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393d277c63e---govejevuwonapomej.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/zuvatemeluxofi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161305fa8c303c---76026426993.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/pawikek.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buganinirepiz.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/vonogolexujuki.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/4869200655.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_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 10972 bytes
SHA-256: 6a737b85da794c8d13df257d707a70342242617a647612bb217f6fa557dfe028
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 18620 bytes
SHA-256: 0d1fdb0823615dce6be9873fa67b075fbe52f8b2a6a82752ea42aa42c70658c2
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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