Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef4a8c72ca34244…

MALICIOUS

PDF

71.3 KB Created: 2021-08-23 10:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5e3a1377b20b5f4072f566eb1b6f294 SHA-1: 27cc63bcda43ec8520c1c4fb7c6d8ee0a3fb27f8 SHA-256: 5ef4a8c72ca34244a2a09d998f777e577eacde1dea218391565b4adbbb5e0677
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=what+does+cocky+mean PDF link annotation
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/27664459213.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mir2q6sem5l1munti9oe7t1c6r/12537711647.pdfIn PDF document text
    • https://digireg.dk/upload/97644916301.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/nobib.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9e311df3295f7170a4698c5db3f63bc4/zenofukusetojo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/741a3014aa94b9ad3d2b6342ae32de55/tomipegexogaf.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/kesumunok.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210716142058_892963586.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43ea8eb4e7---57134516337.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xoduvuraderi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efcaa10e83---50073012834.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/nukibelabira.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/42725101767.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b1087a9097c---dopovobusijadefemevagezok.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/tuzusa.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/20184290424.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e4c56dc0---jagekijonafilupet.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubiwusupapixemamuruwiw.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5a99d5529be059c63b25476f0027d08a/57898799464.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/6bvk3a8tv3c4jm0g51unke1sc1/66163443236.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfaccb63a4a---23467923973.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/jeduxixolabofoxuxax.pdfIn PDF document text
    • https://partnermind.cz/images/files/67126434236.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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 10596 bytes
SHA-256: 7fecb4d809c62b7d32a4036d2ff1a5deb23c73df7155747ed40400665bc77137
font_01_sfnt_off0000cf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1A 15832 bytes
SHA-256: 37682a0c0fa22dd48f43a4c1b752acd9af71ae3a9d2dc412288eb9c4fc46aa52
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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