Malicious PDF — malware analysis report

Static analysis result for SHA-256 077f298ddd411518…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 05:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da942af06f57d3162e21a5e3856db556 SHA-1: 27fe3fdc9142c9bd7d771c28314bccf3b0692916 SHA-256: 077f298ddd41151837e063c0d1411a43884873e8d1372503dbbd32958e55477b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the use of disposable or compromised hosting for these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://j26clean.com/upload/files/pobarababorefobajaju.pdf In PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/suvuligefidarovezab.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/82529469455.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202108212336458377.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/231586f6ee70591f4b4037e24f1fcc70/51092413029.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/josovetedinemewuke.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/57628148287.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/od2uehha6v55m1ld05nhmgh0i3/95493111439.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/83706454932.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1110449c1b---6797193609.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16111fc163bf2b---75086247194.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/558a36a05a56769543a6f8b31a1c92d8/61844062825.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/15f3efb457489a16a5047b2e3b33fb35/11805193535.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/nisane.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/46d6c39f8afa9ee20d2abd3d3793eb52/96266647786.pdfIn PDF document text
    • https://papiratisk.cz/soubory/74803436727.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/7722b4d8cb4c30e12cc45faccc16edbd/fatojulekeludujuno.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/98217419299.pdfIn PDF document text
    • http://bjallstar.com/upload/file/tetefufavaboxidape.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c24ec37b68d6b0a0e4afcc1f34247fb3/vitufegenegagazadukozu.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/bojiramoragizizeli.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c84de8ab231---zevoka.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/30495505575.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7af0ae9c5---kiduw.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210814_021923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=programming+languages+principles+and+paradigms+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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 17796 bytes
SHA-256: f0904051a2e574d0016f7bf685a25f30e0c3d7875859e5d9efbf8716b15d6bd3
font_01_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 10968 bytes
SHA-256: 6a5aa359d8e701356b7f84ed46f71680a3b0b0959562bf900b3ec486458fba1f
font_02_sfnt_off00013364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1