Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b79955b7a4736d7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 00:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82151bf28f2928a5f6ec4e9eebe49706 SHA-1: be3ae75dd25ba6cdcc9ed2f842b96b6edf39d293 SHA-256: 9b79955b7a4736d704226a3ad36b63747ad1acf208f0e7851acb806710aa0ed9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=fonologi+generatif+pdf PDF link annotation
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adca5f7cea2---xubosokenefebaru.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/19649178447.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26cc4feb0---goputilarajezabu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e86c6989c---62427198913.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/91318068550.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wimikewadurowido.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/09eb40a8394c9cb8f239de6bdcc2ddbb/japuwapowuk.pdfIn PDF document text
    • https://beaszemin.com/files/94481982580.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e4bd8337ba9c01ea5ba8105d7655d73b/sokexupexugirojuxavu.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/tesezaviru.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/dinavuxozatosun.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c587fbd4---ropitisuravununa.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/jujikafigenivejuwuruniw.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4f1eda80ed779b7bb29b77e904894ef3/woreliragosutamotimif.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1a41a9bfcaf128830ce8673e2ba09d2c/fomorigimokugejususu.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/jj0eo59el4q2fr5n7dham3fuo9/94821096816.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/85420308250.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/vigexixemofizagipepazisaj.pdfIn PDF document text
    • https://marosme.ro/hirek/file/vizobekar.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/62948188370.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/madubivarokujekixogog.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12513651797.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7f861a7d---kadof.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 10480 bytes
SHA-256: 43471349aa89bd8dd458247528e5bba8c00c014114b7718005d95dd0e86d7196
font_02_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 21336 bytes
SHA-256: 14d80e534b4e752b9396982a047be3afac9fadeb2e0ad23823d205d52b1e6aff
font_03_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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