Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58824bfb23bc5ea…

MALICIOUS

PDF

92.8 KB Created: 2021-09-01 06:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 852187579595b1b72db036a0da0bae7b SHA-1: 448262cadcc134812b30cff6aa6b3d177ca27a70 SHA-256: e58824bfb23bc5ea085f07ef1d3b4c85676bcd3ebc193d160583863d1bd71189
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=ping+a+port+in+cmd PDF link annotation
    • https://betalinktech.com/blmedia/file/99640010518.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607377f6b89a6---76728178670.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/69187223878.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/ritokomegiloredojetexabal.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0696dbc602---917788503.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085987bc18f6---kadodupamaxob.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/2528814126.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/17cn4bann91bf8c31tkgr0mfi3/muxajovidi.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/nunepoxad.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/32908312665.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/51300797907.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a9f863c0---mivobowofubolukodaz.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/tatesurafoxunip.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/bopopu.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/e77cc6e7741e9de83c311b9bb8800b8b/88581853638.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/moxesevumofufupo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609797af9501d---56945402860.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f23cb67d28cfc436308bea48ec833cf1/41014350514.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/vufezobomutibabilezupigom.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8634d92f1---43547228649.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/jijekitejusataf.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a857ae841---81041189459.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8h15vct98vn871h4o8rdt0c2oa/85598515502.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/vawabezugu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 16500 bytes
SHA-256: e86af23e0b02045a9bc281dba257d31e97eb2d5c8ee0f31a5ae3ba5f60c43586
font_01_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 22972 bytes
SHA-256: 41ca2e026656966ae1bd1804c54e53a3f5b881de2504b194f04d1598f5fc07a5
font_02_sfnt_off000134dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DD 10512 bytes
SHA-256: 1de7bfc80350fb99c0e1086acad92cbb777a98c8111eb18788bcccfdd3c0ff87
font_03_sfnt_off00014c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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