Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b7b502582d2e19…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 07:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d58a8599cab392322956bea23e35f927 SHA-1: dfebb8f1e7ff5f505eca90e75b09b3323fff707f SHA-256: 54b7b502582d2e191749326b76a868c62767e9eeb5869e917a42f49345e16b1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to external URLs. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. The presence of embedded JavaScript further supports malicious intent, likely for exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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 https://pixomot.ru/uplcv?utm_term=how+to+flip+image+on+android PDF link annotation
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/68353506061.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/17643755377.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909080155.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/47137665050.pdfIn PDF document text
    • http://fructusartis.com/i/File/97558867569.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/suwinivasatevinenugepig.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/zugutotufa.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/talidubo.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/rumanalilikixukubenesuf.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/nuxejok.pdfIn PDF document text
    • http://yljczl.com/uploadfile/2021090306192557.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nemuretobuvofubadogiwerex.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/mizuloxonojewo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138db5316650---xurezitejuzawimefiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376dacb5726---xolugemotujegatadorazid.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/jimafowomufakugej.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/gisivuvukirigunofij.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/80069811254.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/96622880372.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/59442748324.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1c39ba17---demaxadejofuzox.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/20253357546.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135e677a653f---31704789224.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/25602823923.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/rujoxabike.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/garin.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/jubavowezebabuviviwo.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_off0000bff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF9 10748 bytes
SHA-256: 7373157ede38f020744e474e3cc93631c0d55489b246a39a11f1cd4072a25741
font_01_sfnt_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 17148 bytes
SHA-256: 2093db4f775767b4cf599a12ea068609560f53e606f589c9fac73cb28086d997

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