Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7612d0695a7319e…

MALICIOUS

PDF

97.0 KB Created: 2021-07-27 05:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa7c617bd7f93c69b57cb5e16a6791cf SHA-1: 4e9820bb5646551b67f4f36cbf017b1c3dd70481 SHA-256: b7612d0695a7319e2bebcb594898ce801d70ddd791bfd3e2509272c627afb146
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, which likely host further malicious content or exploit kits. The presence of multiple PDF link farm heuristics and the ML detection strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://solener.info/ckfinder/userfiles/files/dunilajovoj.pdf In PDF document text
    • http://stpatricksreunion.com/clients/84553/File/41347972682.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/idtj4sup9t028e7t1iakl2ueds/90256485076.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a953676b0ebea8e5fc2850b895f9ce53/90625501874.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8aaa6b86---23300456880.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f19506ba48---bixowagegukiripoduwixi.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/44da2337598175efdef89ee2f6507c78/54832234536.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed8da7e4c46525072418c302c6116638/sepegew.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75a223e30e---22900107426.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/bokasetifu.pdfIn PDF document text
    • https://totounited.com/contents//files/bedapodoxakumotivibe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mic098cp799ul2q31302fh2cu0/falisikatixusafoxan.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/600988833776698a5037de1e6b49b6a6/finukutusenusexajafovewo.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/93853108615.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/dosobolovelebotofife.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e45ac47f978---surilamesoruzexide.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090585537e74---zixekulazopameleli.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763b671c8ad---tojuvunujoraluxawewone.pdfIn PDF document text
    • https://webmenuplus.com/images/file/fexuxojotixadasoz.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070322378c63---77813728151.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6f3e2636---jukeg.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/pupejagozagirapiga.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/30be2e0d3ea10868378a3dea63745419/domalidaxaxivobovarizamar.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7cd73lit28jdcbofngega5s536/62888661571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=torment+lauren+kate+moviePDF 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_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 10320 bytes
SHA-256: f8baf59b3932a19270123f3f35e1b8ce221a6c977ad920439ea032ed26c21c66
font_01_sfnt_off00012c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8D 19688 bytes
SHA-256: bd0a94f121e5e1d80a3cb84d4fd3ff96c6bdaee0ac14132b819d21140e4788e2
font_02_sfnt_off00015e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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