Malicious PDF — malware analysis report

Static analysis result for SHA-256 015c4b3ee760b785…

MALICIOUS

PDF

90.6 KB Created: 2021-09-06 16:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab0c99cec46b35ac57f794c972b19547 SHA-1: 995a5c27c901038682eb877558b3fd645fdd1110 SHA-256: 015c4b3ee760b78559bb34c1e46150679d86db9ac197784746a22fb7000c4c72
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories and other potentially malicious sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://pnalog.ru/images/file/dubujivozajabaret.pdf In PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d0be9f7ace6c4315194a4271af600193/90613129913.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105200929.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/panusopexiv.pdfIn PDF document text
    • http://saydersan.com/firma/files/62194704732.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/66c0783b1f90eadf9d038407c38fc6d8/93951890208.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaffbbe9686---kemeledowividap.pdfIn PDF document text
    • https://cape-electronics.com/media/file/19083656546.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/7947438348.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/56338001094.pdfIn PDF document text
    • http://riph.pl/userfiles/file/wazopunabafuzituze.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e83f08d72c75bb3b2d7981533fd036c0/58564265712.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160de540b921ee---mijedibex.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611486d4c3135---54301363664.pdfIn PDF document text
    • http://teknis.it/userfiles/files/zaxufefikotegadibes.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/damibiwowunutavumaxu.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/64786594473.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1b9c8410783185451080f54561c79288/93204643820.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/40765123727.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/u9lr6ie00kih2c52oh64s4k34p/vevibugesonuvimosumaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=computer+keyboard+shortcuts+pdf+free+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_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 11356 bytes
SHA-256: 0ccdb1eb923c95a3eaff67e2b60f43f041431cc6078e80614b13ff2897b551f1
font_01_sfnt_off00011279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11279 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 19236 bytes
SHA-256: 861c8f3b640979a86e55d0b2acf09be44858b7cc1667ca922701d9a61ce34c02