Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c36f332f932514…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 16:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ed4153496871806b3b52d3629ee238d SHA-1: b39654d96e2307124fb98b333764fd14efd596b9 SHA-256: d8c36f332f9325143c0abd88dd0c9ed5765f8389adf6f926273e8def4c0fd80c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to manipulate search engine results. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/fazepexasi.pdf In PDF document text
    • http://officegate.biz/admin/fck_upload/file/javar.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161349585cf194---pogilelej.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/daralanoj.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_8897EB473A819122.pdfIn PDF document text
    • http://perksys.com/userfiles/file/fuduzovadukipalunozine.pdfIn PDF document text
    • https://parkettworld.com/upload/files/47718677459.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cdbd8f7eaa54353210dd47c15a9e6021/vasalikebozasugu.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bogukirim.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/83415270091.pdfIn PDF document text
    • http://platcometals.com/images/file/pufemesulavemivon.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/fazuxifavolatekukun.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/87421447404.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902120240739664.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6e3ae11c---rujibewumelapuvibile.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437cb0a7860---vufagalijefetujurunosavit.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/3080472064.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/70237826995.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/13319242795.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/jinepesenakonemibalipomas.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/dovenidijaparixowimira.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fexovov.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386a2083fb0---mezonopijimalejofaduxetun.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/88855061999.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/kigepenovumowirodawotabu.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/90595849114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=google+account+manager+apk+download+bypass+frp+lockPDF 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 18428 bytes
SHA-256: 2a4cb070af8041c35f5864eb94277aad7ebb7e62113ea1a0f3a62ce283d23af2
font_02_sfnt_off00012cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEC 11444 bytes
SHA-256: 03ab97ba74f245db644f7bf321c8e41164acf0f8cf8931deede52f1283b380f3

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