Malicious PDF — malware analysis report

Static analysis result for SHA-256 553c37b491b18a8a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 05:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba8525eaa51d88b1b57c4089e9eb2678 SHA-1: 3d044ba93776eb20754700c6677440deefa0a8ee SHA-256: 553c37b491b18a8ae5c6bc1a49de991a514d0a7f477ae04ac33929dd0127dd76
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdf, are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdf In PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078acd000159---87188330886.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21668378008.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xuvubidoxomegajowirin.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lhke92d4opgbb6dpeqk9766rmn/ratebuxof.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/fufagofajer.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/rupifapazuwawexe.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/6124559071.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb1dc2ee3---zisadufemoraxanudexubus.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/39706992742.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/71f05969d4bd59ed9f6c1097b06305e9/88484843594.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f5e7fb3c6f2537054e942438b6d349de/koridotukazawa.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/soxelumo.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/vujogukikomobevokoluwikak.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e39b78c8a---12694695854.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/forizelatenurarizuzura.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/tuvivi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/518be800147f0bdacb43f28eef821204/70264485269.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161222b1ce5daa---jaxiru.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe78158ff---15568130239.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/debavigurasosugodirurizat.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/2d7mbm5kb9khha5bkeagudisoa/goromefomebuxufezowufigak.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607186b826e80---mawomumidemotakumuduwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=s+chand+chemistry+book+class+9+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_off0000bbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF7 11476 bytes
SHA-256: 40f469d69e60131eafca6a9d7ae8c79c3b0d307785dc67b8db072da58eef8bed
font_01_sfnt_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 16068 bytes
SHA-256: 536718c984187e7e2dc50a0a11b92526083c7a9deb2661c2417aa37e110359a9
font_02_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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