Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdf048f77b5a400…

MALICIOUS

PDF

112.9 KB Created: 2021-09-19 09:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63c2a5a48861886e6e6f3b263ae549e6 SHA-1: 2d18aec41d6016ab97943e48cff92faf35e1d3e9 SHA-256: 7cdf048f77b5a400c1e910c2574abdde49cbcf43ce301ccec87a9cef4b8dd37f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites used for hosting files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=residential+architectural+drawings+pdf PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613487b8de0ba---jawonusolig.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/favegiwapax.pdfIn PDF document text
    • https://mkontroll.hu/File/52700748430.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132039471a3b---zidukuritesidikasuduvebur.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/89600485664.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/rasikidew.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/kunebegekelibulajedever.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/78941594711.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/4445706917.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161399a66e0b46---nekomija.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xigifapewekunab.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/kojeditamalikuja.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/96075799083.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/10583236569.pdfIn PDF document text
    • http://kahasat.cz/data/file/16580310386.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210912_214424.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/7ot922k9628v66cpk81ct8qoc4/25327480368.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vugot.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/6599934737.pdfIn PDF document text
    • https://cakkue.com/contents/files/67996611791.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/74397867096.pdfIn PDF document text
    • https://songhongresort.com/img/files/31360700091.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/boludujufopus.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/geguregilumogigadanin.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/xitujuwokuba.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_off000152c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C3 18924 bytes
SHA-256: 3ed8f28cda23abded101f57116786de970b37b6dd646a3bb679569001abb969b
font_01_sfnt_off000183f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183F8 11008 bytes
SHA-256: deae500241bb9316990061df6b6bfa53d23b76529e6b27f2973201300fe03d18
font_02_sfnt_off00019d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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