Malicious PDF — malware analysis report

Static analysis result for SHA-256 641c11386b6fd0c4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 15:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 31a28c7cb63e1ef53504a17f40382e14 SHA-1: 41902a218b48c1ad5d17d3afa4968b2d53dca5b6 SHA-256: 641c11386b6fd0c45a9fdb258d6689ae5a9498502914b69131692311f890b8c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external sites, several of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9150e71c45e4f809191ee9b37b8d9a1a/pitiguxe.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e51820c1---wogamimoguwikuw.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/54631358301.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73566792881.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/97980722850.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/24298611642.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/wefufobu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612d85a3461ea---1562447175.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/66682700117.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/96380658581.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/refaguvazezululonowo.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/wedumazesavosu.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/befax.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/4876028b3bbf8970739298aae9eb0b23/fozaledelibizaxokibu.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/juloteduritijigibivon.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2437bbfd0---13359573902.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210610023318697194o6uwux.pdfIn PDF document text
    • http://alkanboya.com/files/file///45417056173.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/76794299668.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d61fc7c20f---53834752143.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/fijubututilanotojoreza.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c077fcb163b---15725305340.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gadivupobanijiramesazaja.pdfIn PDF document text
    • http://jkohut.pl/file/37561144167.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c33a76a5---guzogegibawazafilazoliriw.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/77405511188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+connect+switch+to+pc+with+hdmiPDF 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_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 17364 bytes
SHA-256: 186972aa00ab47cfa6bc8d85879255c09849a4a5b8e9a85986808c5e73318c9e
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 10548 bytes
SHA-256: 624000d395bc68979e85b7a6602cc4da607d010a51729b704010c5c4a6235a58

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