Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d38c7331fffc567…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 02:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a8fcfdec3b937867d7e2d2b1f6764db SHA-1: 31358196fcd69993aac5227c9f2b15a0626b9216 SHA-256: 1d38c7331fffc567391a65de8935b3c0b5a24ec5daec099de80ef7153108263b
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document contains embedded JavaScript and exhibits characteristics of a social engineering attack, specifically a ClickFix variant. The document's structure and heuristics suggest it is designed to lure the user into executing a command, likely to download and run a secondary payload. The presence of numerous links to potentially compromised or disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://lagrupacio.cat/file/gekixapozaxezuka.pdf In PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20900289883.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/44991649475.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/463256508.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55c37e939---74995473633.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/senebanalojulater.pdfIn PDF document text
    • https://ratodua.com/contents/files/46966579191.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613798d05b65b---28267463768.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/73556387607.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/64743309254.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/jitalogujan.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/77301539452.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/luripilulonusi.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/85494595730.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/narujipib.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/43848334729.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210917050536.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134925e6cc49---70844091555.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/kogorefopupufe.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kekusuruxudeniz.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d90c24741---11225856905.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/44058438261.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/bijusunaselakuvaxutuxi.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/basebanap.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a45bcf730a90ee0cf319315910667f7c/jiravoxorameduxowojig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mobile+outlook+calendar+not+syncingPDF 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_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 10984 bytes
SHA-256: d245bbe513bb4619a41e8220d7adeccbfb03bf20ea98c262fbd13b50e9f76928
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 18976 bytes
SHA-256: 5fdef155aabe7b9ad8696d182f94ea4d756b482b5aae21d7c0d74a42733db6d5
font_02_sfnt_off00013349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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