Malicious PDF — malware analysis report

Static analysis result for SHA-256 d462f1590358deb9…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 21:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d98b37f217b1e3c416598a61634971c SHA-1: 2a442da6cb24bbd956920a5048213d920209c2b7 SHA-256: d462f1590358deb9163521341866464131ca067f525d52591619de9a5ef16178
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=ufc+2+apk+download PDF link annotation
    • http://currycornersugarland.com/admin/images/file/lapijarefemosazewifope.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/nenenaweweso.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/suwizetirufoto.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4319694021799af88f465f34310f0a6e/tapiroduvedu.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/nubofifiginafipuruw.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/59443633328.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d4cd7674a57b7bd313878ba0fd343598/63245385206.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/leruxitezi.pdfIn PDF document text
    • http://autovoda.ru/upload/files/naburipivikeno.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/39308401677.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/18676503417e3c93b71032b3c10020fc/79986949462.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/rigevuzevotimonifugugoki.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/nexukunatuxevajogaxo.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/10481370497.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wowizazenefokud.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6d0745c3d---10936568120.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/55633691172.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/46983628532.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/27414005047.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/tajebejasamafuselusil.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/31684006689.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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 17972 bytes
SHA-256: af7972178a44ff3e2c299cc55c740b36218d20a7db205750884996e63e716900
font_01_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10328 bytes
SHA-256: f39d6f9bf14eb3892358ce6bc9c0e26b467315f8931c65067d0553b8b1325e79
font_02_sfnt_off000112e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1