Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db04495afe866b5…

MALICIOUS

PDF

84.3 KB Created: 2021-08-16 08:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 536263b839a9039b40d168ddfa5fa410 SHA-1: 6da77dd1789d3a9060b712a0ed2646577d732c8d SHA-256: 3db04495afe866b57a1ad5f12e0ab89dcc56eec0dd2eac580c9c9d1882ba8ea7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and disposable hosting sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the use of JavaScript for executing malicious actions, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=how+to+tell+if+your+umbrella+cockatoo+is+male+or+female PDF link annotation
    • http://lowchens.org/userfiles/file/tufodizu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o2vtmhnl5arup366aj5h26s2r7/66712318145.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/38cee5e86d1e011e8f6a7e4f77f4f027/62096298606.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/mafuzusorober.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/88d9443b6b6537debfe045a987f70d1b/dubawikesi.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/4903dbc0e8d8a9f9fb2a128ed51a3a16/61535199101.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/85633249342.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/4302369499.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889afdc3e3b---lonorekopujo.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/6eb427affba2670152d245cc370efa72/73421369773.pdfIn PDF document text
    • http://usa-ex.com/images/blog//file/fizamizuxisuwo.pdfIn PDF document text
    • http://praguetransfer.com/files/file/94229821782.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/dijojudumali.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/65132637097.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/998306f76c80464652efab4cf921b098/88954197227.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849bb49a5a3---45504101982.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/79798313741.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/18049418531.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/82cfa12703d3982c5476a59dbdc49484/sanuta.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/284ef7dbb75a65d34c07198441a66264/92716155331.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b90e275e703e39b599cb5277fca792e/mavogomaxozofituvuku.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/tirufir.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087aec76e49d---datisojetiziri.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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 17360 bytes
SHA-256: a9a6c0165f1d9742cec4fd5de3c6dd1d1f275fbae873f084f6861aa2c4c39ce9
font_02_sfnt_off0001284d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284D 10916 bytes
SHA-256: 1382ab6690425386a804af1e57ad0b3e38296a5d421d2025c75e92c63456e995

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