Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a0311cf9a4c3c1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 00:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 754db5d8edffdc4160faf8af7e114dfd SHA-1: 87049f86b0c674ccd7b44a1ec30612e078deac3b SHA-256: e1a0311cf9a4c3c122a7003131ae89dbb1644a398ac03058a9bdbf25362b9258
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/8060331215.pdf In PDF document text
    • http://katela.net/userData/board/file/nafigobukirijepukafo.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/sajuxubaxovakumiripe.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/topulamulimamamafo.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/50902167939.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/menara.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/15480102271.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/42942013815.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/zetexebom.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/xadiguxojag.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/36037320671.pdfIn PDF document text
    • http://ropesadventure.com/d/files/19271160037.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/57885287658.pdfIn PDF document text
    • https://zzwgjx.com/d/files/jirade.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/rubolupomozalepajamutewik.pdfIn PDF document text
    • https://led7.ru/file/wukulurijifekuxabed.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/mupovinixaxegunogawu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c84c952e8---xepisowivikem.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/78459774008.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f3001a82c0d3c992a092d72384ccd28b/lakofizuguvarukedevanased.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/12818275988.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/jekidomunipupoxes.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/95953913773.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3825bc76d2ca99269fa765e413bc6177/vanesanifupane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=rubus+lower+classificationsPDF 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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 10700 bytes
SHA-256: 4e2caee4b6cb1d4c11d6b26a4c39fd232e654de0cdb82138a27a72b8831224c4
font_02_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 17548 bytes
SHA-256: 5237f663c27b100928dd2f1cde38f9c3b7e5dbc7635ef9b797f599f1386c26c3

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