Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a5155f31ee7b64…

MALICIOUS

PDF

69.0 KB Created: 2021-09-01 16:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7eaac1881148d6fc8df19d4522af95f5 SHA-1: ea3f1182d1140ae825a49b4efaa8d6a665ec3fe3 SHA-256: 66a5155f31ee7b64d76ff706b85c5ec427f5f0a3776df3c0fef7ea907d8320e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=chocolate+chip+cookie+carb+count PDF link annotation
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c18ab0597a---49147495177.pdfIn PDF document text
    • http://coumert.com/images/file/degem.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610655637989c---23874994394.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/julokeberuvoxipu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ed0d35e6b423a753aec8ae7800def9cb/dokez.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/73740442870.pdfIn PDF document text
    • http://e-district.org/userfiles/file/81798607520.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b108b78d---98195127451.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/26412053494.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aceeb6303d---xafaxugufaruzadijabojin.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/khf1nc3h9c7tp6lhp1cdc1vqe2/moxesazerosebo.pdfIn PDF document text
    • http://flexicourse.cz/res/file/2821807037.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9a3c28e1a7ebb93cd7fb12a27506a8c0/25361045787.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/63221066348.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/obdkdj51qms6ot7hm31g30rugk/81913451245.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/93702971412.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/23230711917.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60c7666fdb---pilinuvotowuvet.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/sinizabaliwozu.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7777npqj7fnab6grbifgg61j9r/5781725384.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/93740150948.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/76016616149.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/84048255495.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 10664 bytes
SHA-256: 6455583c964d196d1d1212149df44b66d3873012a1c024b625b997cf642fa3fb
font_01_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 14948 bytes
SHA-256: caabe6022ce1727740a56660e0c361927c0886b58313403c342b338d905bef95
font_02_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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