Malicious PDF — malware analysis report

Static analysis result for SHA-256 d261f2237053bacc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 12:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f6a37b9d620c932a94eab927438170b SHA-1: 20eff566c9633972a38985a149b39ec268f620fa SHA-256: d261f2237053bacca89003a72661a049dcb0327e2643446e01bab22106ba680d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure-based attack pattern, likely aiming to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=option+trading+strategies+pdf+ncfm PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bbb298db19043d45548b7bb1e494a47c/pibezawegarimazunufemakib.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2704583826e9f87c765493c5a8cc293b/85453418461.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/walalituvati.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/eb98v5kp22hu7k2b0e6i0oihi1/14259553167.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085d70f94079---vimulob.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/36937590281.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/33097612078.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/nuvomivopanunaj.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9160e278d4---43113125475.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/64112353798.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/kulojefesefebijazaxow.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/22632220547.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c95c18a00---90823131205.pdfPDF link annotation
    • https://nutstudio.it/userfiles/file/kukerusab.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/wemexe.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/23649694418.pdfIn PDF document text
    • http://esistore.be/userfiles/file/7730916894.pdfIn PDF document text
    • http://millecolori.it/images/file/ladorimeboxuvaposiwotu.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/biromujipudunijibarat.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51762429604.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/26634a013fd8c57ad0768867b07e4b02/54643264910.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c98c2ed9a---zemavosozimogezixifamoxo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b7f48385---63745473369.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2c739d640a4f17a9a0540e0087521127/dapalo.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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 10940 bytes
SHA-256: 0c6b49e4d42d4feb1105cc86e9f3608b677437bd4230950dab3ceca8ddc1b8de
font_02_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 17688 bytes
SHA-256: 6dc1584f769c39ad6f19d7c02d5e231fef22fd1ccef5340e2b1e62537add089e

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