Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b53a9308c80455…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 12:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad881df1855cc3836423c0107810b5f4 SHA-1: 81b5112fd70d08d9ea8378c73775398806eb3cee SHA-256: e7b53a9308c80455ca283648d3dae2fc56d46915ae21b5c5f14f3c9cf3b1c282
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards a multi-stage attack where the PDF serves as an initial lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=parts+of+the+heart+labeled PDF link annotation
    • https://paklya.su/design/img/upload/file/bopivuwediwewes.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135094b3d9c2---tilajovujabitotugoti.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/retetobusigizabisogojo.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/tujojirixoporivumupanut.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a2d881ae4---47510170556.pdfPDF link annotation
    • http://tuecpa.com/file_media/file_image/file/finelipugozadomazogud.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/58734215691.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023ae08d9c---nofavisedesilowifofonid.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/46627675699.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/rasutipakak.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/36834653848.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3usrgne3akkpi0ksmqrdd08le1/juwiwiwizawibubixirat.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58658755919.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/nasopanukodubegafipirese.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/75173220718.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021092216020667.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/71604876829.pdfIn PDF document text
    • http://stisk.com/file/lidonazutufagabesi.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/fezuwegaboza.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/37264911997.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bajezukofimoja.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/xuwigetawabavugiro.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_off0000d53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53F 10396 bytes
SHA-256: 2a6ba55ea86f261bb0b61e8250a2bd8138e7b73af9c7dcbe88971e59ba1487ba
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16824 bytes
SHA-256: bae7171cc8d5309c2505fd96bbb725175921d39dd8a8f0f81a9f22d60cc8e7f4

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