Malicious PDF — malware analysis report

Static analysis result for SHA-256 538a98dfd37f0970…

MALICIOUS

PDF

84.7 KB Created: 2021-07-09 12:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dcc7414febc7652628d5addc0c52300 SHA-1: 982ad0f0ddba6f427ff84613344d2798ea6fa6aa SHA-256: 538a98dfd37f097017413114f039dcce960e85061335b7594acd6354cdea2533
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ehomeforeclosure.org/images/file/77972869287.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/kuvofifiwut.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210627_999FCCF9A7956518.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e38afe6c5604137abb2f1325c0a8d61/koluweleribusuferegi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2df4a2a96c2e676a3cdf1969ff6d38c8/magefu.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1c50e3e8596e31df64edd307ebaeb708/kakuzetedukib.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/85831000671.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b89abdaa4---josuledew.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/947772c45cef81e487d3f28fb579418e/boxamedagimamejin.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c7b74b733---rezudarorafubusek.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10078d35b2---82660777008.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gekogofeterulonuxel.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/8897874302.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/kozasuri.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/nuzuremiz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca62c7e84d---mojipoxe.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/82661250015.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eac0038eb7---48138183503.pdfIn PDF document text
    • http://ippon.lv/uploads/File/jakugajatupazofukada.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a72b44fd05---23644870314.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/33161508289.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8a4adf15fc498124bfe3def237abf21b/49299705439.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/joxed.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/nefukebavoguned.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=indiana+high+school+track+recordsPDF 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_off0000e830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE830 10692 bytes
SHA-256: 11c2d787ecbd753496f680b61d09ce3cdd7ab50bce84bb2df9a011905f80638b
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11883 17136 bytes
SHA-256: 050ee392fd9aebbb5870adab538574bcbecb598a1727a5dc42d0f8e8aa46d7a8