Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9978fc184bf32e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 15:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d59d25504cecaf3ede9c4257729fe22a SHA-1: fdf3fb734a177c7a5114c6fdb70d6848e04e81fa SHA-256: 2c9978fc184bf32ebc1cb73be97c46301490ce73680e4f207aa7e12d3199612d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a ML classifier indicated a high probability of maliciousness. The 'SE_CLICKFIX' heuristic indicates the document attempts to trick users into running commands directly, a common tactic for social engineering attacks. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to download and execute a malicious payload, potentially via a compromised CMS upload link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • 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://fructusartis.com/i/File/vafiro.pdf In PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/dodanidetusug.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/fadikimetegunase.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kurosiluzolagezinigi.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/25380273134.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gakosuwiginiv.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/50406497350.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhn299oj3u9kjma51uhlct9jkh/84886198453.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93481682312.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a422cb91cf---pibijexoza.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lozurapinafikomemoki.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zovemugena.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/kosoxa.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0009e3c0668fddbe3facf4922f8b0002/90625968419.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4b7a2420---wepobotalukowosirof.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/61632278956.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xipilulam.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/jukupexujirixaduku.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/vusarejulosapoza.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f01a4fc47---menojuwalugumeb.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/28735978418.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/jefenetuxizumi.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/samonutumitetugogofovasej.pdfIn PDF document text
    • http://katachizu.com/img/news/files/699018652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=screen+recorder+%26+video+recorder+mod+apkPDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 17688 bytes
SHA-256: 0f61d64b556b3d48ef8680e78b067f0faff0b933232afe0d3c063ab2af8666df
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 9872 bytes
SHA-256: e3dd942f8eedbce0e5f32bed6d9553fdd81b1d26f8e99376aaa6402312c12151

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