Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda70dde3e57df65…

MALICIOUS

PDF

67.2 KB Created: 2021-09-29 01:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 31cbbb2016dfbe88578270a6fb004cd3 SHA-1: 20b15989b1a9bd7c9d7abc7cc863e80fde3fcfb4 SHA-256: eda70dde3e57df656a5c0e84be4dfbb718fa9db1b60e4c2974320b2f38edc6a5
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical for phishing campaigns. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://chuyennhakienvangvn.net/upload/files/teduworitojibixu.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130c43a9f97c---80023716340.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdfIn PDF document text
    • http://youil.org/userData/board/file/8972137086.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6fd731138fd8a89ceb5370cf68e5a006/19240901979.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/75921125020.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wusolutelitob.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/96940405495.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/gavole.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/26521092857.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913204450.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/peribusimiguwavovire.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/33376273183.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/delesuti.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/durixoluxotesedavul.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091915335573499.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210921182133_331752237.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/36861734081.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/53515690189.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/delurowewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wobbly+life+free+download+pc+windows+7PDF 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_off0000aa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA60 14208 bytes
SHA-256: 5551e75737dedf238c18f4d8e5410b02f1473c9e5629d038784cab77afeab23b
font_01_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 10896 bytes
SHA-256: e8a5979f97a2c82491f32d337e8c6c4bc1d76975965d3d09730eff3197402f06

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