Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b59ccc4ddc31e1…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2aa12eaf9c6e9cc185c268512b4956a9 SHA-1: 5c332cb547da0f8a3944e258a5b62cba01d1e5e1 SHA-256: 03b59ccc4ddc31e1aa2591bf9fb1eebea8e9738c7f5d802c76ae31837fa56f0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=emulator+ios+untuk+android PDF link annotation
    • http://asr-net.ru/uploads/files/dujuvepojaneribedefatum.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132836c19278---sogakogoxozetex.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/21323112513.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/tifebavi.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/77516899763.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/88368105290.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/polozu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141578df142d---50189855268.pdfIn PDF document text
    • https://laps.pl/userfiles/file/97859925328.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/dirigejinalexegomojoli.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/73636266518.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210909_152516BFDCFB3816.pdfIn PDF document text
    • http://rilta.net/userfiles/files/90915731654.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/4394921936.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/vifodonesazizowejag.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/seduzupagajo.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/fefewumuba.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/22378475423.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/ferige.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b7c97d2b---rerolawofilebiwi.pdfIn PDF document text
    • http://oilspecchem.com/files/ladivalujepijiri.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3b9276192---kakata.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/3313520891.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/97234434678.pdfIn PDF document text
    • http://koala-al.com/d/files/58267207630.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/gisunenavuru.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/91808448065.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_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 10452 bytes
SHA-256: 96082219a2f097d740b07f2e41233dac4076b0b2f7c5f2d23106b6590ca0905b
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 17880 bytes
SHA-256: cefd3ce43cc95f7331650cc3389a79f016dbb6f1cf792cb34c4a522de114adde
font_02_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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