Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4719b9d6d882bc…

MALICIOUS

PDF

97.1 KB Created: 2021-07-29 14:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3452fd9510d7e43cba4c4e8aab24c794 SHA-1: 4b2c4ae890cb8f25ada32e821113093082eb0a34 SHA-256: bd4719b9d6d882bcf00909908d443855d4c69743fbde2ed53167b251701b74c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to lure users to malicious sites. 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 findings are sufficient to infer a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fibaquitaine.fr/cebatrama/userfiles/files/zizedeboba.pdf In PDF document text
    • http://co-wemart.com/careeruserfiles/file/zafiripusisumeseval.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pdmajo6vb4a0h8bo1j0t6rr2e1/17638530303.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b3d3f4a0---wogazexukevidijomaxila.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/47362343841.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c456015b552---nitavuvopakadidinonikuk.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab609bbb51---kosetejatulojevor.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/wejalulejijaporadodunika.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093d28fa1a45---76136200287.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b0347dc9f9978b8b7570e137dfd1907a/47376080912.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1359ac8b5---51832794088.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/ledalufekiwi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a0aa8048a5ab3ac34d7c50c8c7ebfd7/76610631869.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/20296396306.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/daxanefesirazijavapexiso.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/51542502225.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b3a40153e---42819820678.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/49475218766.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806f76f1161---97403236979.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e89133ab6---fosoxuwegitimurixedafegik.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/xelagosugutowozi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zufejukewumim.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/91386890755.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a4198bb23---38961018179.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fonam.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/fupire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+mod+texture+dragon+ball+z+shin+budokai+2+ppsspp+filePDF 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_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 17628 bytes
SHA-256: 3bdaa18c4311adc14ce2197aa59ac074414d3c019f494e67ad77b4b798ad972d
font_01_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 11644 bytes
SHA-256: 7706582880e12bd198e82a96cda07a7c0307be7ce38667ddc2e6b225ea081527
font_02_sfnt_off00015d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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