Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b033ecf596ee93f…

MALICIOUS

PDF

99.0 KB Created: 2021-09-15 10:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8b6a8d64b9516ba69623498bcea37e9 SHA-1: 8f0b92d9a50604165b00dad3c9aade0693bc3305 SHA-256: 1b033ecf596ee93f3b17b84dbaf87295fcbd2fbe81a636a34354bf7b7474b45d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://drafthe.ru/uplcv?utm_term=english+movies+free+watch+online+high+quality
    • https://fontan-montag.ru/img/upload/bemuvezibisegufuxo.pdf
    • https://italvaping.com/file/sivutasuboku.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dsj1hgalj2eq4pkub612ou4n8n/giwugeg.pdf
    • http://cn-junsheng.com/upload/file///20219144613574.pdf
    • http://secondhandgraphics.com/usrfiles/file/30859883195.pdf
    • https://livnica-metalurg.com/images/pages/file/99328290214.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/vewibawukexawozas.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b5d4b8787---libavawusifufodetekuruk.pdf
    • http://holzbau-napetschnig.at/68530262129.pdf
    • http://tongchangkj.com/uploadfile/file///2021091018025377.pdf
    • http://sunwisechem.com/Uploadfiles/files/vixarafazerozor.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/dipizax.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/3383570573.pdf
    • https://alident.centralcms.cloud/galeria/files/ruwubixefanebavuviwaj.pdf
    • http://coumert.com/images/file/vezevofabenego.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/95700040894.pdf
    • http://gardensyellowcab.com/admin/images/file/zipirozelulu.pdf
    • http://aktien-analyse.de/images/File/tunemew.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fbe0462250c899a6473c625c36d05e2a/videf.pdf
    • http://rasciindia.com/firetech/ckupload/files/31794036402.pdf
    • http://www.findvoters.com/userfiles/file/81067684660.pdf
    • http://www.niceresidence.net/image/upload/File/xozevemodaweronutiso.pdf
    • http://www.cottagegrad.ru/files/file/31045742040.pdf
    • http://etenindex.nl/images/uploads/juxazorebutuzexapedodafin.pdf
    • http://shimamura-mail-order.com/userfiles/file/nenafugug.pdf
    • https://ecoolteh.eu/galeria/file/gajomozotededekukutad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001172e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 16792 bytes
font_01_sfnt_off00012f40.bin
e0aa434581f16ac7377a958b4f3aae1afb481089d969bda36e00f5060b30dd58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 19968 bytes
font_02_sfnt_off000163e1.bin
7637e35451c9a33c201abd43ce853cf84357a69fddca5289e7adb412f712ec7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x163E1 11280 bytes

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