Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e846b7e3d7a2c72…

MALICIOUS

PDF

146.6 KB Created: 2021-07-13 11:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ae3345122f8b14866e22d81c48feea89 SHA-1: e69c7f0797d15a77976f5e0f593dcf43f6cf2a8f SHA-256: 0e846b7e3d7a2c72c1f9a030d5562df92d6bd9a18e15f11b1cd1c0c3cf001521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160be4feb29733---2659226166.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/kajojujoxute.pdfIn PDF document text
    • https://ubranni.com/uploader/files/11550290913.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/35367225208.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/tigefob.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb516b9b1---fezikipujovexavaw.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f62bf8e5ada10a5a88de88c6b47ef850/diwofokisuzawatew.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6b983600c8ceb19970adcc0cd3463672/513509418.pdfIn PDF document text
    • http://belst.by/upload/file/wogagisekukirogiz.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a056c97b2af---rijalasujane.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160801a9bc5ff3---28115268074.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/monumexutezedifugidogul.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aac190a0675---21530856304.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/roxodikukomelulute.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160780e501de63---kukafivetewugawegu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c4d7bbaecbd5dba27dfd51acfc774d3c/59857698460.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/20166786612.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fe54a9542---daxumarulorotovabin.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4fa6e5461---49731479981.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/m8d0g6bk2hepgaqekl309jnc07/kafubuxipoz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608768c87e8aa---44274898959.pdfIn PDF document text
    • http://baptistfriends.org/media/97181850160.pdfIn PDF document text
    • http://ducnhua.com/upload/files/48717978644.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p1ngbj79oarb6213ue353dsv9k/bepexonusa.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/epsa4gajcq80d56k3dgb9fkvd5/22657763193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=audre+lorde+lesbianPDF 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_off0001dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC53 10364 bytes
SHA-256: 4abc76b3cefa2ff5745982490c151b2e9e152be0575353b76f2e66ce3252277e
font_01_sfnt_off0001f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3C8 18372 bytes
SHA-256: 320f6ae0fe02b21cdbd2fd20e08c875bbfbe337403c3a31d2996ac65ac712ab6
font_02_sfnt_off00022384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1