Malicious PDF — malware analysis report

Static analysis result for SHA-256 deab48e79dc1b2cf…

MALICIOUS

PDF

80.9 KB Created: 2021-07-06 23:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b683b2734dd8e44a7be573a248a3b297 SHA-1: 334b947c47bf2e9f526cb4a60446fdf1790e1a5d SHA-256: deab48e79dc1b2cf665bb6c6b070702b0f116810dc0d7453c0505b43b0542629
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.0190

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c983ec623b---nogabonuvox.pdf In PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2753e7c9c2---nikadekezexaretijuda.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/48227804136.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/eb6a6b9835b4ec43970bbea9efedd0c5/61590322318.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b4e3c56f---wanuwutipisapubodinirik.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbb6aa3a87---sirudi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/10heb8vadlnpkoj94hbcbap9oq/67823447486.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5727885ed1e9feb79f7a938d45ad6503/9759859213.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/rularaxunaru.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/68476001647.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b7579472a03---lilafejeburufatotusoned.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cbb9421d7947012389fa98ed13f37fa4/11522949792.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/gulopodorozugifetadobeb.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2009cd66---16288403985.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4da75d2ef00d3f98122cc5a76585445b/mizikepologajojug.pdfIn PDF document text
    • https://webmenuplus.com/images/file/95090975599.pdfIn PDF document text
    • http://gchs1966.com/clients/2/2f/2f663f305105093038a7fc4b193dd8f8/File/zaguxudifimuxibuvu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/22874038322.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b548615734---sogiliferukozudatariduz.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xivutosina.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160952e40249d1---87150588675.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051915431651.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/topated.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-5/20210505161551814974.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/kimomoxolapademibugup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=find+k+if+the+points+are+collinearPDF link annotation
    • 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
stream_004_off0001089c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1089C 21520 bytes
SHA-256: ace84ab3e663ba7accb729268ffd07803532a64a9455a13651f52a80b6dba3ea
font_00_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 10788 bytes
SHA-256: 2aecfbbf2e01d1ea5bafc29ac76af8a5f98510c33d1f56e5a5c8036b1a514e8d
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1