Malicious PDF — malware analysis report

Static analysis result for SHA-256 276a5c3b43e4af78…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 10:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32433b89fac71d0342d3f03e34deaccd SHA-1: 4e4e80169ac4beede847fa2efdd85eb5d9901605 SHA-256: 276a5c3b43e4af78b3b47f02b1d804994fd20fb19b67461c2461fdce2efb7fc7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term=minecraft+java+key+redeem' suggests a lure to trick users into clicking malicious links, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=minecraft+java+key+redeem PDF link annotation
    • http://secretlove.ch/ckfinder/userfiles/files/sabotuxanowij.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/wigixojoxuzovopolakiloka.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/savusoleduju.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b79afc4ee009ff7cb1d41771ccf0099b/kariwimotele.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mhtg455rii6gq8unnh6tk1j9l2/61713391083.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/26584880004.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e370de7723---jajonu.pdfIn PDF document text
    • http://hocomesun.com/upload/bunajugibupapi.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sogesojilililokubazivomel.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/lusazukizutepukuviziw.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/67190241144.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/dexudogemutowogutodo.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f46e576c0---60496484493.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/64807782014.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/betolasonar.pdfIn PDF document text
    • http://annabarons.com/files/files/73789096505.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zewipaladawadivefa.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac3a2b40d---juxoparukazapiwavabada.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://budropol.de/Upload/file/pufafulobunizenonisunabux.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/wiwopokamufaminoxuxenoko.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/91123065557.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/24034842635.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/32999829768.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_off0000b1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BC 17492 bytes
SHA-256: 6e3b7eac3b41d8c2dfc59123c90e2376da7e899932e2a7d84e5375e9df6a4a80
font_01_sfnt_off0000ddd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 10696 bytes
SHA-256: ee4fe44ee6bb674a7166502a11f3c2c4348df9c91b047a7c491fd17e24a06784
font_02_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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