Malicious PDF — malware analysis report

Static analysis result for SHA-256 013634da54e98428…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 05:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e18c78601b62b52ef9a8d311e00c84e2 SHA-1: 51c7f6ed52b2f10495a1eeaa0a5cc519b99f7561 SHA-256: 013634da54e98428f530ed360e2ec37d983629dc05ac65bcc670bf349d11d189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=best+crappie+fishing+in+illinois PDF link annotation
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085faec0d463---47105091492.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9n7a78n50ck6t31jvukfpr9l13/94046008204.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb19ea8b5---zotitixazo.pdfIn PDF document text
    • https://migger.dk/userimages/file/79172541804.pdfIn PDF document text
    • https://avenue102.com/uploads/file/jujinakikorewegiral.pdfIn PDF document text
    • https://edarky.net/data/file/98339718514.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/238beaf0497422930e7e6b9b722acde0/59149770998.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/88889341680.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lrq9ha3dkgmstnidlihrgr9rev/xusozebimiluke.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/49874100448.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a1cf0e04---nawavokukakosazusalamus.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6d8ba120e1b373ef8b23626145cac23/77215485159.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9679824f10710488aaeb0990b834c286/67790273511.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae7ade0868---38262982433.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a47274ee---99755576625.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/simidodolaruvize.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160753d8641440---busodobarenisanenuj.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/netakakuwod.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/24612a5c2bf3e1e5189b9a76f5707ecf/wefiguvokigaperipib.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd652eed---5795967975.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f29e7e80859961e3fb2dc79bb0bf27e1/neluxonikapidijomowava.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de53ef5d5a9---kideboten.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4d9f740dc257d7e59af24d9c4ed1f050/vigivamikuletexivoz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4fe05f40---tojedogudalebekizujuz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bfd203e3---296539715.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_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10812 bytes
SHA-256: eda07c396a855f5d3b7b8f7de5741b3ed20b0ccade6357f329ad6670d7f0d048
font_01_sfnt_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 16720 bytes
SHA-256: 84cc34df137323c72bc853fd96f474a36910d4b4d5d72e366f1198852a176811

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