Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaab97d0aaad269e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-07 21:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0d8a3874348c9b1d9483851054bc233 SHA-1: 67b65041ba29ad298494103343253f9c7675c101 SHA-256: aaab97d0aaad269e67a1f9f33ee3b95b2165f654086bd3b0bb42cab47ebed4e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous external URIs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=senior+year+checklist+pdf PDF link annotation
    • http://www.siposferenc.hu/html/75989570648.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/58025293375.pdfIn PDF document text
    • http://dakov.hu/_user/file/69130819667.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/mq7ptnvmk31u5frgokn4hjq8v7/30655136111.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2equnpd5i8emuepmdrih9ecllt/96424157876.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160755f8d4093a---putojirobi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/89710214466.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a66bc6706---goxabolatiwipukujolo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bce36fed9---27709737160.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160738c2030eca---43795668467.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/pixanu.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/67532643487.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/sagojasutijajad.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/54193383287.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2b0a2be91a798868a5840d125d8ca799/20711684361.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/cc61c8c1226880beb794ad03d924340c/balokub.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/5c0332d191b9c16106d9dc6c3a79fedc/98544940829.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cgqltmaaojanned6qecpilumrk/11127197468.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pulebaxivuwevumesimagere.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/danifiwozar.pdfIn PDF document text
    • https://hirurgija.me//files/77278961247.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/gijunat.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/2736373520.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d7a14d710---83597874796.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080ea28df332---nerodema.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/4398077070.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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 18004 bytes
SHA-256: aa70621c8a856687b548ad684f1d4cec411786885d41feedf8af569162a8254b
font_01_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 10996 bytes
SHA-256: d398e6d4d44802549533c26fb5843f4f63b1b5a489263d4a0ab32109561d243a
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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