Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9d3ba6e88b7d38…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 00:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 00517e99fc4137c2427784d11e568b0b SHA-1: 377ac4cf900dd17c621d7a8c3b483dd8ef9a31d9 SHA-256: 1a9d3ba6e88b7d383d983f9e6b28af1c6de9addce018553f65dbb38a3a538e76
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 domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c838466f29---sifanuwux.pdf In PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/38040063981.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/meterixumakajejafobofuba.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/58130049648.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df0b23f3---wopusuxugolisebenomelefe.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210910210442.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c8a6a09a---85195461439.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kiwamubipo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/96539420650.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddef09d66d---divumodetixelaxudul.pdfIn PDF document text
    • https://linker.tw/files/39513876456.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/64552045019.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kowiwovixobelaxo.pdfIn PDF document text
    • http://hzqzg.com/d/files/70044356778.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b9e0ba6f47084aeff2fdd0eeb3e1945d/5576484446.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/50761498552.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/panume.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410f4b49ec3---34483285614.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161343f3ee3661---leguletupagemefoz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368740e2b93---sapijejunitufivon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=24+news+malayalam+live+streamingPDF 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_off0000ddf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF8 17476 bytes
SHA-256: eb1b4aa8be6b1a1f45e790effd2e6c1b13ceb084921ae522e9a4ebb6b907f818
font_01_sfnt_off00010b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B65 10696 bytes
SHA-256: 037d310bcfa3294ad768e49b3dfe431aaa05996f9f6d85ad086352a09e52e0ff
font_02_sfnt_off00012407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.