Malicious PDF — malware analysis report

Static analysis result for SHA-256 3576af309c8a3f34…

MALICIOUS

PDF

96.9 KB Created: 2021-07-16 20:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e5a197b91af7d63db78f7c88e822ed7 SHA-1: 7a72a926345082785afcd9f67621d62d29e70699 SHA-256: 3576af309c8a3f34c9eadf1fd136e73723f16951cb545f0255f40a238b3de5ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated high maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to disposable or unknown domains. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of multiple external links suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/1a3a0d66f16dbc803e6f990a467dcc62/suvatiruwalinave.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e1adc691d---76451069785.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/kujiwagevepekezamar.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pivutemabenofonot.pdfIn PDF document text
    • https://atl-50.com/files/file/wuxudaniv.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16cbc5b2a---ratedituruxesumexeduv.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e409eff1e898b4e69208ae57ddb47c7b/99569607451.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-3/20210703070602629752.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb7661d04---sanosikopunu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608256141bdfe---2820316701.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vunodatabigevifirisidixaf.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/99189085590.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/90640170579.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/dixafibugadef.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/63593603890.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924fbc907bb---wimibafamurusiwen.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/kugigiwokedesifux.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/17045207884.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gejatunirasidot.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/29659863989.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/daab8cb362a074eda143f80d9220cb5d/pamokiwonujevejegiwif.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/sobekisosapakemut.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/26793760267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=4+divided+6PDF 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_off00011be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE9 17420 bytes
SHA-256: 27410d70b34e34dfd326a0ac651a7f1ae031c5cb30a72e6131590c1548a53150
font_01_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 9660 bytes
SHA-256: 165ea80a8a6cf570351146e18c05c051f882a8859ea86154201b95a98b8f8f7a
font_02_sfnt_off00015ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.