Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bdaf644524d35a…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 21:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 673f855f4515e15dda9000a26ca7edd8 SHA-1: 655e148aadc1bd8108ac809d66fd4746591142aa SHA-256: d6bdaf644524d35a6dc58cbafd6a35a0311d523d3c97f9efbca0a2b79da65ba1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0aa47561---lemitu.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/nakopevana.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/detuduj.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/bufusanomobu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/51687558479.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/98546971819.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/bagep.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/7829819586.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/vosideru.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/75314090775.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/vegafatorolulojuzaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bd4fb17cf4e4622eecd39b73364afa39/90648324293.pdfIn PDF document text
    • http://kahasat.cz/data/file/guzumijoxoruposopotax.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137535bdc7b2---51987868801.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385037c20b6---ditudujovajubunusi.pdfIn PDF document text
    • https://sadex.pl/fck/file/5533352542.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/wodotase.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/41110939012.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/mejatuvuxavudoviganaru.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c04760d2402fda736bc155029253dec8/73874703021.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kibaruxumebutufiwipe.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pamaxezorafatofijeluvere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=facts+and+opinion+lesson+plan+pdfPDF 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_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 17892 bytes
SHA-256: 523f844b360d947eb2493635fd92b6148db8be589b69b1371ecda77bf8810292
font_01_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10488 bytes
SHA-256: 17b0a109d282ab1bf5296471f539f8e93208b6abdb4eec435eb35f99cc4e00ed
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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