Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2b6f0e2f466a23…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 00:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e5fe4073ef6504bce8e71e93a8a01a01 SHA-1: 7375bb914b351a44fd48cd50fb5e348d851777f4 SHA-256: ca2b6f0e2f466a23169903fe8ac45af71ba1c736637a6ef5b14034ac32f42cb4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to external URLs, some of which are hosted on compromised CMS platforms. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=pokemon+soulsilver+apk+free+download+for+android PDF link annotation
    • http://life-homeshop.com/asset/uploads/files/tosimos.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450969b014b---jagixebevoputalowikelov.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/19154582546.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b2647b527---56825760267.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/tezamasomizupivijosekife.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/55059003749.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/nifidekorov.pdfIn PDF document text
    • http://humanlitech.com/files/files/71205436800.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/rireme.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/42246795296.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/woxikisugimenagawut.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zumemejidibenaso.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139003993850---40124311518.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/30683801224.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/mufazovutovepibeluk.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/rejolulajixan.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc102dbc5---suxevipugin.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/dodetevevivusikidowozulo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/mojukateza.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/81900357223.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/47092472195.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/jamoga.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/53041504146.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/ralutiro.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10904 bytes
SHA-256: e2ac0321108d211e318e7d131053feb898486127abfd4ee43786347942469c86
font_02_sfnt_off00010d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9F 18152 bytes
SHA-256: 1c5f5e216b09cf3baadc256b0d39f7a967e608a45d18deead57c2f45e144a0aa

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