Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e1e2da9cbef357…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 14:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 6ba6f99c0e12ac42cbd62532ca1776af SHA-1: ebdef80d478977b2625d2c50edc8c18485a48b73 SHA-256: 84e1e2da9cbef357270d51d27a14868c52c3c6b92dd07877ca99c5a145be9ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to multiple distinct hosts, some of which are associated with compromised CMS uploads or disposable hosting, increasing the likelihood of a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or execution of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sake2metustin.com/uploads/files/31645919977.pdf In PDF document text
    • https://handientu.vn/userfiles/file/88055761627.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/mugedamulojogit.pdfIn PDF document text
    • https://keongracun.org/contents//files/zuwepe.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ac759e6---66659810831.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/dimegawudowutexurosani.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d114da49---95452876671.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/facc039b28b40880c83c29bf72127845/94876414928.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/44253786877.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/82746248390.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/bvvcool1876lvkonkt0khj77t8/25724246049.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1b1084c---89000200970.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/61014017208.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a6d0d9f76---32406675001.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kakikokisegube.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/4a141d90ef4a93e340bfc2bc8b5cbd6c/79863862528.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612679e7d2291---65011364264.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/16443636010.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/922fq07qh1a1fcstkm4i90mo0h/kelozuj.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/kilelumibodowelodorapu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7f6a6a0a6f---69495466809.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f824559a---88601851462.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/25940815795.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tagizegubadopuwisapixa.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/vivumemukesumikefogovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=chemistry+significant+figures+practice+worksheetPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 11304 bytes
SHA-256: 4d795eb3c3e994e949d99fa2ca097e650a112d40bd14c1042bb380d9fe161c2f
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 15212 bytes
SHA-256: 27129c1e7967fb51c20023b4f6a0cc7604dd535763fa768831fc5fe4a7c78b93

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