Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5ac5510bf3bbae…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 15:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ae8c01e530a0735c5bfd9e1cba2af38 SHA-1: 87fe171f2c45f13a3f2377c5ea4c204c6c5b5f0c SHA-256: af5ac5510bf3bbaea0a59770cc898204590b565258a791a35866216d4251a928
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=how+to+move+clash+of+clans+from+android+to+iphone PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f83a51c30---parogata.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kudomozulaxogakoravuvetuv.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/mijabowanigidu.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/wilakiwiluzi.pdfIn PDF document text
    • https://phukienbep.net/media/files/97183962186.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/53d8b4dd33e3b81b7f89365f544ca12f/raratu.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/wakebisat.pdfIn PDF document text
    • http://acelybio.com/upload/files/63997425500.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/33459891986.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/18515606867.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/70910845263.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/xogokeridaxatunajon.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/kadop.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/18331169667.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/zeweloxesofotun.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/veboru.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/lexevaje.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/23612543279.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/pufoxokukavakek.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/2487219825.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/rinux.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/zolokuzekedewekonob.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fdac1473---76458155258.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b1b11d68---15657129176.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_off0000b2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 15748 bytes
SHA-256: db10b00241bed6da6e36d004d46d00cc8578227c5e490dae66987ed6b3f2fe2e
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 11028 bytes
SHA-256: cb9d9dbc0c6ecf45cf269c7e223ea6ddd35db56d326c0d2fb6e4ce36aa9fc5b4

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