Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b20bc5426eee4f2…

MALICIOUS

PDF

83.4 KB Created: 2021-06-11 15:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b5c07b02fe17ddc9de2c6cfd148616b7 SHA-1: 04f2870fc093abb3732a196013aba171a1d4a5f2 SHA-256: 7b20bc5426eee4f2ef0aa25e34cb38c866656dfc35a70913a995436ea5121d9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=marvel+avengers+beta+apk PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3571a0515dc621373a6d16abbf9bc80e/gelerenajupukubamawutari.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a0ba9bb074dd832df6894d7f76f6d866/14742119421.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/taxokad.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/8c7d8d15a6fb19b2f22fc32c512338cc/koneviradit.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160703e12927a8---pabininigulifozufodi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1a45903a54ff39815bdcf5b97b01b674/37252919461.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b4362647---timakifesosapinodavol.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/saa5nprbil0q3ul4kr8vn44oi5/78253694857.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/71430b365e7bdd4554c64b8a9b2618e8/90187738447.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/62e669a0db41e9dac56f99594162dc45/11495325839.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/04c4ebf133304331f0825fcfbb19b69f/wekuxixuzaxoxudatukodome.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/587065ca7df14890ca3b67e9c72a6fab/52842617832.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b60c5e891482aed3b25391f131f0fbd4/8236976873.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/liwurobanel.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d32ea316---70887533589.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430101318517131.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/021f90e2ca7dc4a6753cd9ce4de3c248/14419241052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 2960 bytes
SHA-256: 00c0a141202c10936ceac8b8df9df75720096dbedde9c5fde8d9f3447cbb363c
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 5256 bytes
SHA-256: 7b6d3aa49d526e55bfe74e275928e53e6b15ded33a6046260390d0aa2f06f32b
font_02_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 11484 bytes
SHA-256: f997edbccb0040404d96543c83c2403e3b2d2eea589abc6468e67d649b4418a4
font_03_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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