Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b2c543dc8d0653…

MALICIOUS

PDF

91.0 KB Created: 2021-08-21 21:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 148583c41b9700e83b266b56932a72d2 SHA-1: 4bd55a494b7062b4aa3548d839248feb91737455 SHA-256: 70b2c543dc8d06536ef389ddaa58fc6b19671c00a0c74a4f18dfda6791a13182
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The presence of these links and the overall detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=circuitos+de+accion+motriz+para+ni%C3%B1os+de+primaria PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r5cpt38bfgurvh8tgmsih4q4t7/67825156719.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/17374061359.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d2d362af0f6e7bdf5202242ddf9269d5/91597121978.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eddbf4281cf---96049416950.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b756635b2---59980722788.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/77370147191.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bdc166910---gogorugagademituxereme.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bd61b1d3---43086960320.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe9254eda---memesefomuw.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733b7e4ebfa---35735019160.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045570648a---mawutajobu.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/manofenofulupebuzorafuxu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/81957386789.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/3229022013.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jikujiwijol.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/jamawurikomijaxeto.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608747e5d4688---8174318115.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/epu0b3a7ig3eoocn0ctfdre86l/dapudufigaladubepukimev.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/gejoridetorafi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/60096200739.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/94618490864.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161132af6881ce---wigek.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/vbl9hb9r8aafnhsf55stei5dhu/simozud.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/logekifudewobopudo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160746f22e1665---tufapo.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_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 11028 bytes
SHA-256: ff7e60b86c226e5c49841720ca81e64b0d50945a3589578d90d7337adc66ecbb
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 19120 bytes
SHA-256: 5ba0833f646dbcabd7bda075203b56ece1b26b50eae045cf023fd3d42648c99f
font_02_sfnt_off000141ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1