Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c6d04e90d38efa…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 20:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4635a37b14e93776bbb25c5fa23306f9 SHA-1: a7fc74b7823f14fc079f15bc14c3b8c70e340038 SHA-256: b7c6d04e90d38efac15795069fe9b3ec6333d8526aa0e4f312a71445648d956d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. The presence of multiple link farms and the use of UTM parameters in some URLs indicate an attempt to obscure the final destination and potentially engage in SEO poisoning for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.nomorcantikspesial.com/file/bebumilepabufunet.pdf In PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a7cf1db7a7f87e4560fb790e9a2e2ffb/totagazatotesominoxuxobip.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ikktt53bapkbvh98urfer5n93r/15134901399.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/nukoralojifilisug.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ac0bf6157916c097e3d8d7c82586eeaf/63784103497.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60853f89d---nalevogatujiwaxovotixof.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c32fab64b15bfef9ff4f46774a037ee2/18888902506.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d35c62b9f953c7803e20376de7c1f0b8/sakejobapa.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/32113851160.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/dbac547ede88168a91da54a938e77112/80594506905.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ligapos.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/7910991758.pdfIn PDF document text
    • http://museeducuir.org/upload/files/mulamomejotenukegibop.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ml4vuq33l234htptthdsum2eva/2858093874.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/38637753257.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/25116944077.pdfIn PDF document text
    • https://oasis-travel.ro/files/xanulopefejavakogijaxag.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/71078493638.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/vupiwosapir.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad75b9062---zojajojewonogobudekitel.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/2526672924.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/36893492762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=currys+essentials+slimline+integrated+dishwasher+manualPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/43a5ab668d4540fe66b851f7ba352db7/84983743436.pdfIn PDF document text
    • 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_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10908 bytes
SHA-256: 59213f435d907589ce0d317db079c220dbc247744ebdbc3a4aaefaa40bad530c
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 17824 bytes
SHA-256: 18b8d7e658346c9c1d9ddcd2d349820dd1b19e254891cc6f7e95c7a181ac87e2