Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cedc43a09db3ce4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 09:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 178983e0c9799fc364dc26ceb9269caf SHA-1: 92e6b433498d16d602e0fdb52aaa018f481835b2 SHA-256: 7cedc43a09db3ce47dbcf2e9fd19c4cd773c50fa8eef8dab5c58530805a5a4e3
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 websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm and compromised CMS uploads suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/nakuxunulon.pdf In PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/64768384824.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/35411677241.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/jisafemokotasipapusegife.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416ab03e8b3---kunomefaliwowomekufevi.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/kuwuk.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336aee6b20b---mubum.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/10943119331.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/84275920286.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613998854e98e---pijowo.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/11439674481.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/wijuxiwizalimikobabo.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/53418142237.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bkqm5aok7qieceruik2gl66g9s/wipop.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/81313587864.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/28126254721.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/92571665845.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/forijipesobidiwaparezoret.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/40517296785.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/26271318869.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/46909724761.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/3580508988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=outlook+email+settings+for+androidPDF 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_off0000ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB1 10916 bytes
SHA-256: 6b601ecdc5d8c71bf96d46c155f66883d03f4b70aab7ae7f454c214daa62e6cc
font_01_sfnt_off0000e7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C3 19016 bytes
SHA-256: 3e4121e86eadb771c9ccbc36a56b4904b8922ea4583cc566c6a6bd848dfa32e7
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1