Malicious PDF — malware analysis report

Static analysis result for SHA-256 865ec505998feee7…

MALICIOUS

PDF

85.3 KB Created: 2021-08-19 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 910c6cd27f6556a3546bf032cf459397 SHA-1: 5ffee0c9f844974c3673155cb6bac0e746d479cf SHA-256: 865ec505998feee778aca0468eb5b092e157ad46afdd7303e7e6ab44d6a160e3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of numerous links to potentially compromised upload directories suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72a9ce0adc---72392486364.pdf In PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/kifagovadolep.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/2163738052.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/poladaxumatukovavidi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/rosamunizejewokalodofe.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/83358423155.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b5abb9eaa8e5464f5e68fecc5bcf6618/ketuzaluvibarafadum.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5764af1a---begusekoj.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/19908524907.pdfIn PDF document text
    • http://inse.us/uploads/images//files/45793248526.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/92602465739.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb2873d86---32340087074.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/osptc51gp7d5hlp9s3pdd58rf8/govezowezelagijaromibowe.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/karidipij.pdfIn PDF document text
    • https://lemanssrl.it/file/tumoligefufuzebunim.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/464952ea9888e82b4ea8080f3e1fb8dc/60064898057.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6b0b1a1b6eed06d0f984090701c74947/weruzex.pdfIn PDF document text
    • http://bociany.sk/media/file/weluwokizafukulatepol.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/71291523338.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b6ff85345---rumusumun.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/timimutojuperojibisosizig.pdfIn PDF document text
    • https://np21bellapalermoshopping.it/file/47074834117.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a2dfff9eaecc631a880799ff80ad8703/71421358416.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210724_CD2CBFE09C4DF2EA.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+need+for+speed+most+wanted+android+highly+compressedPDF 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_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 11268 bytes
SHA-256: b3a4898a65057b6eecd3bd0cb6d7c564e7ca1848a70443406f3e1e16ff55390d
font_01_sfnt_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 18404 bytes
SHA-256: 7e34e5f4a59e33bda41976fc98203264ada0a75bcabf907de6717379691466a9