Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2d4b11784caef7…

MALICIOUS

PDF

111.4 KB Created: 2021-06-29 12:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 08a0341b70b9f08d21f4262643e1a3ee SHA-1: 58b30eb337c4389bdcb871e714deacf9999db0d4 SHA-256: 0f2d4b11784caef78f4503ca7c8fc05c95ef755bea7ad69556c7a52b5014ea67
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS uploads, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160776792e09d6---91431061437.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/40c01bb8d5e9c267bd6dda4f412f8e93/gugiralevutusosuzilupugi.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/50041150883.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/77104474773.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/72093630947.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848b6462b1b---90583499317.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/jipak.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d9727f0d8---75779633639.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/55745773858.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93aa88e44---jobipuwemoge.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/pejusevuf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/78fb727c227c1cc5b381ce2244a003be/40330481397.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/wumopi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/1ig4f3pug40qhdm431gm28eo4a/mewune.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27007071d6---betejuvegu.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/btaf4v2jbe4dv9rdcctjpdfe6e/mesopig.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mddm8feo3ee59n06rnbr5m71ri/milivufugujixalaweti.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sakenazeru.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pe24tnfbcj3hd5jd7kv98j29u6/84678977589.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/kugutekinemetuxodokus.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c743d3b1318---jegamiroburosapewam.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/0d4884f8be503e3c46a3fde96e666f93/9701165761.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/61eacae7ca75808734bacfc0117ec0b4/jurebilenulaxovadixezos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=power+rangers+2017+weaponsPDF 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_off00015094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15094 17976 bytes
SHA-256: fdd86602fc2c4766a08e6d76214e9c0f6ee3b5366b954ec1242c09067669e3f5
font_01_sfnt_off00017f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F7A 10624 bytes
SHA-256: 76cf92cfa8d5f8a4ec7b765b861dcac622b77f209e084bc0a3230a4286a11e53
font_02_sfnt_off00019819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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