Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3fcb0c831f9ec4…

MALICIOUS

PDF

96.3 KB Created: 2021-08-23 10:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92d15f96d166c82174217a84cfc2348f SHA-1: 7f368a773fbac8c5a9ee48d8799b12fb6ef90105 SHA-256: fc3fcb0c831f9ec4187ca923ab48f5ebecf5fc6de083cf88161a9b400b906c32
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised content management systems or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://www.awakohchang.com/image/upload/File/iwagiwotomalik.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661ce21715---liwebut.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/28410338678.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/964d0b9b34f53ae8dff164a957d09e4b/28660094036.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/zegefoso.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b775d921394---wipojanaxoxizijugixamaga.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a73cc0acc0---80395157874.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/feguludaranegepula.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ntftci3evtosjlshmqfp66n8m/10196530870.pdfIn PDF document text
    • http://godswaynehemiahmbc.com/clients/878002/File/12247481153.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/45357480515.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8iqq4n3cik7vaj4i6id9o3bf7j/61797993340.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aaf6t5s36lr28aboa97q5e4bb2/tigot.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/pikegorexarabeg.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995a3a51bca---jigadosumagij.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/nozivakes.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xedegagu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/95819240051.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jaxixosetilov.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/6a287eeb421e36a1f1be42f164c3f9ca/13951292400.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/16499863658.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/74c42011be1f41edd812fce37c1a2284/vikojejo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609403f36c4b2---wuverosutogimalo.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/tirunugapov.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706e93ebe48---xidusidorus.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/dd28c66e0c1c70c2b4530490c07a5124/wenewifatojugisaz.pdfIn PDF document text
    • http://capital96.com/userfiles/file/solajodekudev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pain+is+temporary+quote+eric+thomasPDF 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_off0001127c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127C 17492 bytes
SHA-256: fcd8223bd8ac483801add4d10fa24b9f1499ec43f6850dc4ac8e7c225d211fcc
font_01_sfnt_off00013fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD3 10956 bytes
SHA-256: 4d3b2f94d179cb83ecfb6ce35f77247a69e6ec37c95920a6e0e14b63ba4bb29b
font_02_sfnt_off00015914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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