Malicious PDF — malware analysis report

Static analysis result for SHA-256 10cb40c6a7981dc0…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 07:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aee3a1752e89dd223548811658cc05d6 SHA-1: 842bff18e1492262c626fb3bb4a7aced23198e1c SHA-256: 10cb40c6a7981dc07b16fd7024d85901e688fbc1ae9ffefb8b716c3575e7f95c
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/57fc3ef35811b4354d31a5444236f435/sanevolewodomodakixafebo.pdf In PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/53778453942.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610a38ff3a62e---rovopijexeveb.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a6a3e1a6b00356709897482267f912bb/66736519253.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af95c939607---6562641816.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/kv98fhb00am5esfgidmmd0nroe/gomosimigazefowur.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/wojiniwevexugimuvofitim.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/44673304479.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fa1c9f6385013426975bd72aa260fa05/73762111010.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/40fgelo6fju4pmsjl0a9i0iq7g/fuzagilesobujur.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/45140254134.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/61402112875.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/31984540288.pdfIn PDF document text
    • http://altinay-law.com/images/file/solonalozojuwusirejelupim.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/78349926104.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd13ddb53---64693811110.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/s0aff3gnkno3tknlo78omb0dtn/vobowuwupevi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/f4c64c35387b1fd7470f49bee3354cdc.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161089885991e4---kupabumopife.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/dejopikegagafedudopadipij.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/pefaw.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/c81e3f7d906eecbdcddf7d98092b6b78/basifenidudelad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=second+ionization+energy+equationPDF 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_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 18256 bytes
SHA-256: 8faddd15f1c9b6d3ed476d84c009c1a5758fce3394deea32c6a9ba9f7bfd1e7c
font_01_sfnt_off00011ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED0 10824 bytes
SHA-256: 3480e84ec20aa75653f278ac6590690a0cd475ac5fc565c79db2b33c9ce424aa
font_02_sfnt_off00013784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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