Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a3081ebab692f6…

MALICIOUS

PDF

73.7 KB Created: 2021-08-26 10:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d95c8659072bb50e79b5738a8154cca3 SHA-1: 633d65d665b48f6af1cbf3a1aa36d77ab31e0aed SHA-256: 67a3081ebab692f60cb76b19cb24b0530cd20da867e1f903ca0e2d109bc33975
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=perfect+hard+boiled+eggs+in+oven PDF link annotation
    • http://chineseclothingonline.net/File/5555004389.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/48959722436.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/712764bca06dc7831e46ffd9dc2a728f/woxap.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/92459314529.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/26db7e5e48033448247842e743db0951/39933051496.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6583f1ec3---4104579939.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8j4u267go227ec72tdcqft63m2/vawipumesoxorid.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/85432414020.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/45244736986.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/96136676564.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/24815458619.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/bazakubodo.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/zupiv.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/bamif.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a944085399796ebf9707083d70e623bd/wevejevaleb.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/39004917566.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/refalugodanivewanew.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/rewupuxutososofabasasef.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/52509040684.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/85smkhkohb09257mjlpu4adcc1/89270804269.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zorejukepe.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a6f0c93d9---41552532516.pdfIn PDF document text
    • 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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 16580 bytes
SHA-256: 36f888424edb36d94a25bdf7d7689c62407c81cc78ee719a9990283aaa750ccb
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 10960 bytes
SHA-256: 21e95324ae1e2ade94e54a8d063e87ea6429abfffd5af3bd040a9b283273a2a8

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