Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a688212cc42f97…

MALICIOUS

PDF

80.7 KB Created: 2021-09-01 13:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f5b4a4a4443e993c63e1706433756ed SHA-1: bee84a0e8a9ff6f000c4c3024f81be8a4e67a4e1 SHA-256: a3a688212cc42f979a955987a1c76584d59b2aff5c2edfd9f59e748ec5a688dc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating it's likely a phishing or trojan distribution attempt. It functions as a link farm, directing users to multiple external websites, many hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest a tactic to obscure the true destination and potentially evade detection, likely leading to credential harvesting or further malware downloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4890

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://medvor.ru/uplcv?utm_term=journalism+as+a+craft PDF link annotation
    • http://curry-box-deluxe.de/userfiles/file/90821512140.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/morufigadu.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/d067a86ab49d1d5ddd77fbe7fe514ae7/30367619430.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3ps3jq71cfpeksfidt3060u9vd/lemomotisapuv.pdfIn PDF document text
    • https://daismene.it/file/gavukuxurik.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/47385641267.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/61487941923.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nufusowedobanuropepirinud.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/61904109083.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2b8337c2f0725c7894471b83eaa38dc5/34461737880.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/49342941000.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/22578343596.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/kufejo.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d44819c90---tixirozijukupukoluritepox.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/madagavokiti.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tisorawadiwu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/65454451493.pdfIn PDF document text
    • https://anfauglir.com/images/file/jipafalamujeso.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/956c87afa9b952ab270bfad96dea18e0/77427253524.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/lixesuxek.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/725aab174e9353571d3ee9a27fb07928/86178935401.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a628b255a6---25764993932.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/95780513180.pdfIn 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 20000 bytes
SHA-256: edc57d8073780770114fc09cf5f448d1aa6a66cf5bb0cda6951358d56ac58a70
font_01_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 10456 bytes
SHA-256: 970ed61aaa551532db78bf88b580f91540f6abee483b1ba9c045c9340563889b
font_02_sfnt_off00012e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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