Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baa88aa7aafde6d…

MALICIOUS

PDF

86.6 KB Created: 2021-07-19 11:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df2b6fe5a6e88c09b4fb2d930d5bbf6f SHA-1: afbaf9671034b00d138cc54cd152c5b3bbc510ea SHA-256: 1baa88aa7aafde6d8ddb00ad38e83dc6ec6d1351ced27f1b07dbf9cdbd2c4c9e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/4c0a6270a8163ab423ee063cfde0d93e/ralojajinumemevoxudibev.pdf
    • https://fonixkoncert.hu/upload/file/39343834424.pdf
    • https://atlastoursntravels.com/userfiles/file/nibadadevewavasefe.pdf
    • https://zapcdn.space/web/img/podborky/files/42132429309.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/rozutamefikovodovokari.pdf
    • https://andrejc.si/files/file/tiviranonivepijiperug.pdf
    • http://norrlandet.se/userfiles/file/63929591510.pdf
    • https://conexkarvan.com/cache/fck_files/file/92740081450.pdf
    • http://aps-mes.com/files/file/82384682320.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd63568347---wumopiwusowitufuzeteje.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/bc8809fac5b65afb84ebdbb8d1b6d49e/86749969072.pdf
    • https://12shio1.com/contents//files/tulimoxafumorariwoselu.pdf
    • http://chi-kara.net/userfiles/file/guwetolexalela.pdf
    • http://ladue69.com/clients/876446/File/wopasowakagubefosil.pdf
    • https://birudongker.com/contents//files/90463392625.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38e551233---63458507972.pdf
    • http://kolasinprevoz.rs/slike/files/81952028238.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dd9ee73e---pugopasul.pdf
    • https://machnhaduong.com/images/uploads/files/79052119606.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68608540476.pdf
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/fasixinidofemidaru.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bef30db11ab6feb6b286882f16e5fb97/xovukopeworiwiganod.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833b08bcc8---bevedogi.pdf
    • http://zap-interactive.com/uploads/files/98784418662.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=names+for+girls+3+letters
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef13.bin
a771d2efab8ac5b112c0b5921860f2daaf8ee0ec06f3f495785c9c61cb24f71a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 17604 bytes
font_01_sfnt_off00011d03.bin
35549fc105b4d762a531340512b01158d0034a845294a1dc656e27017e535ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 10600 bytes
font_02_sfnt_off0001354d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 16792 bytes