Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfdfe2c12a3f1469…

MALICIOUS

PDF

102.3 KB Created: 2021-08-17 21:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be56a3fc72569261bc6e2fe921922c7b SHA-1: e45f2872911d93252e3b3506527bdf6591a1bc59 SHA-256: dfdfe2c12a3f146928cd33374a063cc46e9481761c433f49d2e997c9f41ec926
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm used for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d70d9fdb---jabowolorifamez.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2d5bd7a32421d72494538d0452947c6b/parijokozapoz.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/9085622287.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/66496774539.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb4f32b5c9---nisamapodetuketirozusex.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160713c36b8a0d---gerofuto.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/zadafuxuzero.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/5791985992.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/23899010315.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763be8d3a91---xifidevutizun.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63b33dcd29---mamuvew.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/bisibexitab.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b36598d17---dofijaxojeg.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/21641986064.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/7c04f1c02289abe28127ab157fc4a9dc/nijedanaru.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/78815247179.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/2udtoudjh93nv9opttuf5peha5/73179414537.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9794dfd882fcac21a91f426c6849a362/19508476362.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de487d595---33008920421.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/robuvelobuse.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/80160826905.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/vixarujesex.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/bjl5buiu7s7q4a7cu6ge5i6kr7/77307540943.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf6c2cb992---63520847508.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa36bfccf12---21547327663.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/godiju.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62844b867---33741344969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=icse+english+grammar+practice+papers+with+answersPDF 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_off00012a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A30 10736 bytes
SHA-256: 30e3f04e8723b30ad0e17820d955cd750f4ff014f9bc8b1f3ab043852da3e8a6
font_01_sfnt_off000142b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B1 17976 bytes
SHA-256: 893e35160b3da55b878ee6690751dec300b4bc83189aa5d51eb5b4da948fa9b0
font_02_sfnt_off00017231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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