Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e99c6f79a12539b…

MALICIOUS

PDF

88.6 KB Created: 2021-09-02 07:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 105538fb852c7cf2bdbe57ca2b893731 SHA-1: a0a094f62fdc65a18ff4d108278ea81178307581 SHA-256: 0e99c6f79a12539b031182a74ea13ef5477a9fbe3b736d67e272ad96a861c69e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ffb9c941a---xumejapupoga.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d413a477---68177923133.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/zasil.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/55327112563.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2ff2adb9442b9cfed42a6e27849f18c1/wodipaf.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161288060f1e2e---rotoxarokakedilizawomuxox.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0a4irqoi1rm03b07vmati99uqj/vavukokatipaxawozilo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2f6fdd09bcec568c3de82a21e5e590b7/22685967888.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/sumejavoduf.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8641bf40a---sosirasisow.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/gupuzipomenizesi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d5b89003bc1be39d1c826d2987434ccc/mewetizudufat.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/81bce00e93975446bb9fadf21a589c58/romaforazu.pdfIn PDF document text
    • http://benrassam.com/uploads/files/moregumupipi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/73055603606.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pajozejivowego.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7851f46b15d7ba7523f0b4dc0bb370de/78352585816.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de487d595---33008920421.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e3d04ae9d---79775689985.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/80796497592.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/83121950713.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b5a1d7f6a3bca378169c5047d4693d07/96417198780.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/waxanodorefixenujetotofim.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/97572db8e9eba6f9db319afd3d98dfce/nenosapepegibul.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/22076524749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+dye+a+shield+in+minecraftPDF 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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 18008 bytes
SHA-256: 8fabae556ccd19c9d1222cc47f1edcfe064b0b0a73c8fe14311dbfcd9e340be4
font_02_sfnt_off00013a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A39 10984 bytes
SHA-256: b88ddcb763760b2bb90ed7fcfa6eb49374f53b2b6c7b41b7ab6e25ad18fd6530