Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30eda08d9cb79d6…

MALICIOUS

PDF

85.5 KB Created: 2021-07-29 15:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fb1e2395a2982b280725c265e95dbc7 SHA-1: d99d00598394bc99d2faf1e53926974a49b67609 SHA-256: b30eda08d9cb79d67e48f574bdbd7bed005c70d7c609429d524c125ac4382f46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or phish for information. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution campaign.

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 http://etyekilovarda.hu/userfiles/file/40377573584.pdf In PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/e6sftalbuqd5oh0c3lv0gbtd53/guzadoviperutegapizuk.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2217e48fa539012ca3535babdcb1196b/562565740.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210722_8C00200997A4487E.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094342bd9cb6---galuxeponaxo.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/65980072613.pdfIn PDF document text
    • https://sanidom.pl/img/file/96965602029.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/fezuriluzevuwukuzarobat.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/pefoxinuzat.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/02ba5211227629b0b87351ba88d0446e/tukewibefuwesozawobir.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e55d3371cc4---19850328406.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/d0b779def79598267546dec5d23b266f/fufakujase.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/46672880008.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075a5bbbef3e---varuxokodevanawikuwetowod.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/86780499655.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/97613884779.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/5138760990.pdfIn PDF document text
    • http://allasclub.com/campannas/file/33989558567.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e18f70e910ca0fc39ad829ce2343455/56905264220.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2104c634a9---xiturozul.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/xuxegatabimitosajeju.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/dilowedesavas.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/biwobopotirek.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609811694e7b9---nugofeditap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+free+apk+download+java+edition+softonicPDF 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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10980 bytes
SHA-256: e6bcbeeb29a54051c1b680683aae437972dc12648406e4ef489aa1fbf72faaf6
font_01_sfnt_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 15960 bytes
SHA-256: 34763fd90c47813330ded89f1b1bb777335397e1c452af462657dd328dcd1c3b