Malicious PDF — malware analysis report

Static analysis result for SHA-256 f189a1f341d9b548…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 09:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83b3fb32b3cbd3b71cab07b2381f2131 SHA-1: 13291e779e46c941ab8f028a8afe336461dccf4a SHA-256: f189a1f341d9b548ef2c29b0b72414ca912295a4fa29c8330a35aacec8c534ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users through a series of links, likely to a phishing page or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=earphones+settings+android PDF link annotation
    • http://ncfc.com.tr/ckfinder/userfiles/files/larirojarimoragodol.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/51111978719.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nupufexezisavolagi.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zegobapizusa.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/wonoduvuba.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/navasefanonoj.pdfIn PDF document text
    • http://otczenacts.com/media/files/5780195443.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614306387e443---sozosunejaruxo.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zogeranuxomiz.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/zivulekenelenitob.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b95c16e468f12541be48f95855190df6/ragorilabebujiguzadiva.pdfIn PDF document text
    • http://thegioioto.store/upload/files/minajonomuluv.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49202253197.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/747e9d476320a0517ffb06267c17c9e9/90300256416.pdfIn PDF document text
    • http://eventechsite.com/files/files/18012331580.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5eef15701b3301bb6c5546e7c43079ac/wamanidozusofuj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ee382cf73---kigamavotutuwo.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gurov.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/40604944661.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kazujisonivo.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/85586694306.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/suratudebulatukodunudij.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9c94341a---68600637197.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10608 bytes
SHA-256: cdd1aa3b884061e76ebdae32c8be2a87326b450c2b77c706673c9a7b01f418f8
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 18660 bytes
SHA-256: 6c50751ab52f7651e0b2d2e3e75d8c32d64ed099c4fc7ce56423985a15e5c586
font_02_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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