Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc174f2c5779891…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 20:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3aa0e15bf97684158a772955d3445a84 SHA-1: 11812d9bc02631d3e1594a7fae62fa07f20b51fb SHA-256: edc174f2c577989100d3136e61093dd56a89280d2a5b4f2b380fee1f8c8d0a5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://drafthe.ru/uplcv?utm_term=interior+design+books+for+beginners+pdf PDF link annotation
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/86d67db0b9cf9257963768b721d384bc/sepemanuvunaj.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/a4adf72fe9313470e63ed4877b29e2d9/88647055207.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/mavipuvisadinifatujusowut.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/93684070672.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eec94719f---57832720759.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756dba0940c---lowabevitufiz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607312f6eb0f0---64456190270.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/46124277649.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/kipeluzu.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/dcbd9b3c7e1b5d43bbd4d74ed9d2243e/zujezex.pdfIn PDF document text
    • http://coatsofarms.com.au/ckfinder/userfiles/files/90978051464.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc5b70da0c---31585485880.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/lipesemesisuni.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a36a2272---58619691954.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce0693984---88961020096.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jq7u7h41ren8ulrvo12filthbq/12513651323.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/88449049030.pdfIn PDF document text
    • http://gr-chem.com/upload/files/34264294542.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/90628c3d353d7648ad0a3e96792eb6f8/97518245541.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/28301270750.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/fefudir.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/tewirarigexo.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7bf92013c---vowiwesaketelinu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/021528557448.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00d957a45---11418188351.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_off0000e465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE465 17644 bytes
SHA-256: 95d540241fd134bc1f57f14cc07b3d6cba0a177afd74e2eaa4a1b57ceeffa670
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 10648 bytes
SHA-256: 46b172bdf7525b2cd30bc2e1ed08a31333c18f5d8e9271f79cf3438eeef8918e

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