Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25bab760305d212…

MALICIOUS

PDF

101.6 KB Created: 2021-07-27 22:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8b1ac137d853f7c6966fe8e2867e918 SHA-1: a10c497e71ef5ee7476606d666ff2db012ea2d00 SHA-256: a25bab760305d2124ecc46c288e2fb697cb92a50c2a7c10d2ecc0e2ddb3a0782
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and numerous external URIs suggest an attempt to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://malopolskiszlakwinny.pl/upload/File/28100979478.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/rukexenovubedugudujabonev.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/99729112651.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/84973917111.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f539d42f02---10403077784.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14cf075c6---wusidikefijijedalagati.pdfPDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/file/nimetonotuxudurex.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/suvebozadame.pdfIn PDF document text
    • https://cubic.is/userfiles/file/jegegopati.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076be0735771---52231602234.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/52928346795.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/rofelapawavuwijegobu.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/686dc5ee748cf04f58f96b7d34250180/66224979957.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ee670d6---sorefelegipudize.pdfIn PDF document text
    • http://108homed.com/userfiles/files/fazapiw.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb48c07db8---werupuk.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/15686622846.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/diduxinofuxosof.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fukos.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ea7h5rqqofadua5m755t5tkf90/9394370845.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/68edqe985dv4j8rumoir84jrf6/xukegitojinedet.pdfIn PDF document text
    • https://apronorte.org.br/ckfinder/userfiles/files/78598115726.pdfIn PDF document text
    • http://alkanboya.com/files/file///werelitiwiraxez.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/xelovajinet.pdfIn PDF document text
    • http://mebco.ru/images/file/takab.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/51251226184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=airworthiness+directive+compliance+reportPDF 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_off0001285a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001406c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406C 18180 bytes
SHA-256: e358f7c53ddbc2fa73e24a2b7c097d0ada84f6a466a30c716c1395a29846b765
font_02_sfnt_off00016f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2D 10912 bytes
SHA-256: 500b4abea875961d5f5e236995ebeee96f9e7813f5a206fa3bf70ecf04a541ce

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