Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cae9f31d52ce9b0…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 05:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 527dc1406c0a62981a65515743d50390 SHA-1: c807419f062e0fa1880a4e16451a66f105cf7bc5 SHA-256: 4cae9f31d52ce9b069ff0699f8ecebb3732da66c066c0da8e5b1c37a0227a365
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, suggesting it's designed to redirect users to external sites. The presence of external URIs and link farm heuristics indicates a probable phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://pixomot.ru/uplcv?utm_term=cs+condition+zero+android PDF link annotation
    • http://namthangbasaltstone.com/uploads/image/files/xuvivalofezezoravenijopep.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46789006049.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/7509324183.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad98e9afa5---19501175553.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/zigufatereneja.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jomegefenaleronew.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/atl09h52olpficcvb6l6vgmu21/kuxanaruremurunujiwi.pdfIn PDF document text
    • https://computerzone.pk/file/xapifujufelulozolow.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/tabitafin.pdfIn PDF document text
    • https://cargobull.cz/res/file/pakepanudusanogironinewa.pdfIn PDF document text
    • http://blccy.com/userfiles/files/vabebijudenorat.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/83303444027.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/suzuz.pdfIn PDF document text
    • https://andana.us/files/files/fejosetexosagawobodid.pdfIn PDF document text
    • https://polytex.de/sites/default/files/68572621329.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/votipag.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/48742327588.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/29460131602.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b6be549b---58691415906.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/8c1a580e2597df4f6b9e891133b7c294/66227050180.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb536dbe1---10544725734.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451580ea733---kisazokavedudukalodiwebuw.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210907_63AD19F99DECC01C.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/82502024741.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/rijuf.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 19280 bytes
SHA-256: 1d5e1ab3c0d54694c6a46db9aa8ace5449ea7d53dc3d98af3118d63e9c00d8f5
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 10408 bytes
SHA-256: 902949990f52c4ce6976c9cb547ba02b9cf156b77717559465cc63e449290523
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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