Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9fc0a0b3321143…

MALICIOUS

PDF

74.8 KB Created: 2021-08-09 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdb1fd9d790b5bcc8001f11ac16529cb SHA-1: 83223350d250d535ba24e3add588e69b32a16e66 SHA-256: aa9fc0a0b3321143b4a369fc3a5ed54e5c5e8eb3a0c243d5e1619321673a4cac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is unreadable, but the heuristic firings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/qbj4v367chlt7t8gh8dnohfe1s/mumubelazuleluwa.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zudokaworusizajez.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2b35d50e---18065393070.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d0107628e---20488335959.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/73342777411.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0373d279---vuwuwirekovu.pdfIn PDF document text
    • http://amandamaitland.com/images/file/92282348553.pdfIn PDF document text
    • https://anjingliar.com/contents//files/zijiguw.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/78565402871.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bejomekep.pdfIn PDF document text
    • https://migger.dk/userimages/file/20247628685.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3jrqk26i8udbnjhum03o49hl3n/bilumakarorivuwepotadukon.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/winikujotepikitunegej.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6d974de5c8f42de580fbde50dbd23c2a/6116956664.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/88662625743.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4ca32fc31---lomonikaxitog.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe4224fcc---mosananuretoraj.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/48274587384.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106828c814cd---fumazezifupimo.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/35787607408.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/kawoxigudigitelowosa.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c64b3d5583a---58244287635.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/vonuwibutilibab.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab137996df---retozig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+play+the+cup+stacking+gamePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16852 bytes
SHA-256: 6f1b5dbdc61b3de86cc8968bcf08716bf4fd4a5512b03123a8e8a182a1c56267
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1