Malicious PDF — malware analysis report

Static analysis result for SHA-256 a807005898c72e39…

MALICIOUS

PDF

119.4 KB Created: 2021-07-19 15:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ae9a34bd6ff20f56f4a76803834e2f8 SHA-1: 5dc4c647c4cfaaf78335d7ef909ad2e94a05ad6d SHA-256: a807005898c72e396d9b41add689dcc8e8e8e0dc99e7403193ebd8a3a2e4f0c3
126 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution campaign. The embedded links are likely intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b0t3fjm4t1fqpc66b71brefsfs/1618982929.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4b706a383a29375fe08b2edf5f9fc423/44120487540.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/17219077052.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/nararibirutadidijafo.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sefavafaje.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/sepukevatobi.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/dasolupasoxaz.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/wowikilokesiwekega.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0ccee98769c7357dba7f4d29d04e4d48/wavamurozixezexotudatig.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5cj4kedtvnjh8adcq7phj4omd4/46145797842.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/12290042905.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7e3919ff608bd9ec10dd8dc073f2515e/vazanigijomutovezozuwe.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609f00cfe66ec---zaludemuxom.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4604353e91afb072f847ee8ab06077d1/rabixakikizabuma.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/dee6a2627bf8c0d48b4041039da63103/93922282865.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/e9cba2eabab4581b3c44828ead9e7055/xolurulu.pdfIn PDF document text
    • http://vejwun.cz/images/nudezokebarekijegeliketa.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/23856483853.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dadda25da6b---49267749657.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b35e485af9dbd77acf255c87925c8d6e/gumidirodatome.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757916a4189---ruvibudufanavafakafezanig.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430005446988496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+eniac+in+computerPDF link annotation
    • 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_off000175db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175DB 18884 bytes
SHA-256: 7e04c8c9449997dfb6a9e147fe73ce5af84ea9afb1a73f45f502f72e8a09cb4b
font_01_sfnt_off0001a75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A75F 10704 bytes
SHA-256: 000bcd75a4426f5a6ba4cc2eb7111444339097aed45f5555b77e3bcd64168633
font_02_sfnt_off0001bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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