Malicious PDF — malware analysis report

Static analysis result for SHA-256 410f64e6ebfbcb8f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 17:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21479479f9a095363ac1f88962813e43 SHA-1: 6240e4d3f801580cc2f97a9a97c43ed5bc3ce267 SHA-256: 410f64e6ebfbcb8f90ee262a31369646e678a9bc8f0eed42374b6c9f442db65e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=bosch+classixx+5+manual+romana PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd634d2b1---56574716131.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/33709681275.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/c239087782b65565d31f6b97cb529023/vavozinepuvakek.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/a956ee4e3578ad031876322f05abb7a9/47523383402.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/wibalofemuwo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff86d61a92---33573278320.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/damivarewo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/bkd7iv0fkoggg0lk8comkfl564/jakenifakova.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/sufodepapupefazozazanoru.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gaae11raaq7ch5mehc63qu6e6f/natifomunujasifuj.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/xemerafefadofifuzexi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vivokizasejalubozuwidez.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/94057926477.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nesiwibesoj.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/nijolebimuborelaturuwi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/24229990269.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m3usd2b2av5kedgmugjdposn01/51765443790.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54257638090.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/momusipumetasobasiw.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/siwerixapuwimu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/78375555766.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609513e558f4e---25499514781.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/52683658935.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/60959838830.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_off0000c10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10A 18672 bytes
SHA-256: a87551f865f39a9e3cdc88cb2e6fde11081440582d4d97894137d07d8fa051be
font_01_sfnt_off0000f0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AE 10656 bytes
SHA-256: 70f1c92d207ca8cda362886e2a49c3c28117da090782ed11534b6b222d303dde
font_02_sfnt_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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