Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9b2625543f2de1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 07:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e7505a79fef4c59108f03425f3e19a89 SHA-1: b7b7aa14de93e054ea4db099e490d53be25b9d5e SHA-256: 4b9b2625543f2de1c9ebd3c8ab4ea06d7c748e7142d59b856eaf1fd17e7c1ca4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+selection+online+free+pdf PDF link annotation
    • https://sukaunited4d.vip/contents/files/48792054940.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/53042715482.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137539b7a4cb---3353718564.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/52514119799.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/53187801526.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ad02d8f9---lufepaziwumudus.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/runukosozatifuw.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/nodurawowarenusogikavag.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/timofulixenuxal.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/lafolemebikodewadogusetex.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/51251077236.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sefivo.pdfIn PDF document text
    • https://maria-galland.ru/files/file/34874878050.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/23692767222.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/037aa0f683fe60587c1464ccfe9c26b0/nepibaw.pdfIn PDF document text
    • http://bdnchem.com/upload/files/69861395209.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/delusir.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161418f9703998---80711349322.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/ziwebigar.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/kozewigodozizudaneligido.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/19875463276.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d9f5540550ec6220e221ac12821fb79c/jumesipujogupavevasiba.pdfIn PDF document text
    • http://belniig.by/public/file/zudalavumuxovesuxovejuz.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/telegagetawekituj.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_off0000e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10520 bytes
SHA-256: 3605d2f85336721b9cf5d926c891f4595db0070fa3e2566328ab87d5ae1adb8e
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 17880 bytes
SHA-256: ffc7f97d6afa22d1682e0432cfac7eef8802c5d3a824c1484dc20598975b771c

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