Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb27c802e2b9668…

MALICIOUS

PDF

77.2 KB Created: 2021-07-29 19:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ceb5f215057a8367ffdd1d1114d67fdb SHA-1: 979d4de33391cd37fa07213cbc3905897ddd89ad SHA-256: ddb27c802e2b9668965d4e2aaa7f8f86f79272c3a17fc5d9130272835d96aada
196 Risk Score

Malware Insights

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

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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://smidgel.ru/uplcv?utm_term=what+is+government+accounting+manual PDF link annotation
    • https://alexandrapanayotou.com/web/images/static/file/24660092047.pdfIn PDF document text
    • https://linoforti.it/file/95164469812.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/56262921342.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/17379068577.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/br8fnha5al6aj1fs4eje6eor5s/14867758194.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae1e37dbf---naxilavaliwizaxodevuveno.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sanj0mu2gumv7kd4ko3igitsn8/manedubagunesitajaxamojez.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a020bf3950a---56889427047.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/95938870927.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160be44ea9db7f---18182351163.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/ruwijavegigegujuwab.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/78724411133.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/85826532694.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/57693493347.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/fozoguzopitepoza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba28eb9f03b---35760726481.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/faxoju.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/96649055995.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a61ba5227993514354462c4117ae9838/kikadalugik.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc656bc56---68240695912.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tisuxukevetipijepugepapak.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d67b63e4---mipinupa.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lebigugawi.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_off0000cb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB71 10836 bytes
SHA-256: f3e4b331ef8f3735b50247273b331e87c7bdc33f50272bf1be1064cb8e5816d3
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 16804 bytes
SHA-256: f61a840e6b280248af42b3fd517f67ee66b4375d54fd96df04baad38a1517f97

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