Malicious PDF — malware analysis report

Static analysis result for SHA-256 867fd5210b29b61d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 07:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23848e4acb208834aaf579bef5b32aff SHA-1: 0a8d0a3a9ce3cb907a434a294d1fb7f4200f9fbd SHA-256: 867fd5210b29b61d03f5a2879356253b46cbfcedb56bd38e4e5a6e237afeb73b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent of luring users to download files. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score indicate a malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=download+downloader+for+android PDF link annotation
    • http://ifap.it/images/file/24473975224.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/12910382422.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/6200177018.pdfIn PDF document text
    • https://www.znackakvality.info/files/wiviripujima.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/11752795470.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/73396070179.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/2286192822.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/85827956836.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/89081259336.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435b65e8ead---29568094505.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/12352639527.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/kobepuxetadizox.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/zisel.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/54078132432.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/gukuvekebeboniwiwir.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/16730533046.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/80686069877.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31282037900.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405edbaa26a---13017109731.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef813b80ca---wisojopavijabusev.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/28ffacab262eaa164542c7a2a8901ed0/40910307277.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/labodutowemijatajoxeg.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/15002328118.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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 19780 bytes
SHA-256: 2a8056aeb11de263d212c6b7223a6f4138087d413f869409ef4a3270e4be02c5
font_01_sfnt_off000114a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 10168 bytes
SHA-256: f2a034ac500711570ead4c8d55fa208dd614581e41361164a0b1a3bd8e35c491

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