Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52420f94267630e…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 01:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b2cf160d112cf7b4e18effffdff784a3 SHA-1: 495d855f98041e6d04ebefd613f559a96770b1a3 SHA-256: d52420f94267630ed9314029f6e110749bc62ebfb8a6868e4745a093350c6496
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

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 https://trsoftyazilim.com/genelresimler/file/xenuwimedenefol.pdf In PDF document text
    • https://afra24.com/basefile/afra24/files/tiduvoxazoti.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/debulofozijopibone.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/76888726742.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/titipisuvaga.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/jokuxonelevalasepuzegax.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/fupitulumitofozuzu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/fikalamejakezalu.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/55132624819.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475f6bcc6d8---malejijaxobufom.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/ruvijozu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614656e0b7fb2---nubukebonavoseka.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/46200334909.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0751aed0---98413315431.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sav6a8ll7necckcg0qgdmqibja/dezebilezalepigovo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f291ea07cba84ca311691f0d801975d7/gewaxisosa.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/27810366970.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/82755272363.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210908085636.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/93315686697.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/giwij.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139304b35b29---sidobipigus.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/bowivovukosojozubofuwuso.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b417760cc---13847824411.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/34336073620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=xbrowser+apk+downloadPDF 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_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 19036 bytes
SHA-256: 5654b9d3b3b01fe8c3c1b362cb397d6e0d153bca8cf02eb4a272de1f4f361fb1
font_01_sfnt_off000111dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 10520 bytes
SHA-256: b25d66ed62688793e9507219b65137a56c5ca50fecc203001ecbeefbe440f962