Malicious PDF — malware analysis report

Static analysis result for SHA-256 408ce9102d525574…

MALICIOUS

PDF

74.1 KB Created: 2021-10-11 01:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: af162993b810c8ac34d7be01cebf88b3 SHA-1: 63dd6711cb308709d34d5a18ce24d25a47d57c73 SHA-256: 408ce9102d525574515d6a15ee4cd60b60f1d5840ec985cf91b1841e653118e0
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=world%27s+largest+whoopee+cushion PDF link annotation
    • https://tyko.pl/userfiles/file/30503250174.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/kabolazalidasenuxij.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vupebafijovigujevav.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/dofupusavateratina.pdfIn PDF document text
    • http://klhl.com/userfiles/file/wefonure.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/dagowivude.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7710accd---pakosetoviranesulovijini.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/jubobexe.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6fa551f6---vesamureje.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/20226472831.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109050750227123.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/jasibilupupedobuso.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/4145961417.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/54197047460.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/843342f43118e3d6cd2dedfbd34ab250/55550804212.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/38182545655.pdfIn PDF document text
    • http://vina2002.com/uploads/files/89458434349.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/46697dc9bed9255991ecef878c8aeb03/48672098471.pdfIn PDF document text
    • https://cope.lk/assets/media/file/satulebikugefupe.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/xaresufegagemafux.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/linosiwuvojew.pdfIn PDF document text
    • http://grupophi.es/uploads/files/51791579786.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/17227210100.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143160d9823a---55699564416.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_off0000ba3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3D 11008 bytes
SHA-256: 29e157239d5b6c4741eb7756e86d7ca7e527969b46e789f78d97663869ba817a
font_01_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 18100 bytes
SHA-256: 56f394c32625061f0d2857d97092d146acba9e91c43830e8e3afb72ffd46a3b5