Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5c7497f16fd006…

MALICIOUS

PDF

87.9 KB Created: 2021-08-15 03:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a0515ac2dfa44858634c27810460795 SHA-1: 8a2b36b0c334912fbc0eef0ca1e4e2ff76a9dbe7 SHA-256: 2e5c7497f16fd006a055cb6058211ef34f09875174881297b0940ae24d82a07f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, further supporting a malicious intent to redirect users. No scripts were extracted, but the presence of external links implies an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=excavator+bucket+drawing+pdf PDF link annotation
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/669b9674d8272d60b739f286a7ea1d1d/27800484802.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078351b50766---11076425095.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d77ace228be---64273088327.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/89264386660.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a69b8aeb55be823a29f3494d1da8cf22/33325950656.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/82376634796.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/d3b4c8b3057372c98334a40265ef3637/26229881922.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/76741575842.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf3447a69---6523151783.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/699d2f98ecc7214fff9a6b6651250183/17634471021.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/20729169146.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/83321015058.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/sivoredizesolufimazo.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zeluxama.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/58015310748.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/simesibakawifupivasebad.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/safetodumonovu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1492fe1857---97050444142.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/kelimogamosu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/14de1835d96aa9e2c78ee4d950c4a4ee/gawomam.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106731bfff---90649345741.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f2302837c7dd980f44d76417b24538a8/98301648850.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/31326051705.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1628806541_1.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/pokiwovap.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/nav3nlolk97j6sbb2b5vtiddm7/fegubiwuxazokuki.pdfIn PDF document text
    • https://vestol.bg/files/file/vinujepesipa.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/74224731805.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_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 11148 bytes
SHA-256: a3c34f84fc6a781b5a0563351929555d414c664b924a4c4dbf91eeef67b77a9f
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 18120 bytes
SHA-256: 8b12008e5ce2c36a83647fa7d45da69620e177e58e8baf2f307d150ebb37605b

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