Malicious PDF — malware analysis report

Static analysis result for SHA-256 abe4f0d05701db5c…

MALICIOUS

PDF

74.1 KB Created: 2021-09-07 08:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 947a71a39a003efbc63219a5d0ebe527 SHA-1: 87fc2e37a8789eaafef68612b2aac2001e69969d SHA-256: abe4f0d05701db5cedb7fcaf6fe9326e68f18ff7d95326cef91f4eeb1a8d3e8d
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/76960577040.pdf In PDF document text
    • https://leanuslab.com/UserFiles/file/79678305996.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/92885789693.pdfIn PDF document text
    • http://mamam.by/upload/File/file/rapuneruzawasonasirepado.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6e292b83---mivosarododagifibalus.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd662ddc7---zijakuna.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/zavelewejupa.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/86907942929.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/86383115957.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/38428513966.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/up6uevo6s6pkj6vlsskg1f9l2s/10730833372.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeef899d3d---pakenil.pdfIn PDF document text
    • http://jn-zhsc.com/upload/juzasuxe.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/60610035060.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/levonubaf.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/fusiku.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/47125881826.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/nuzoz.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/45759475394.pdfIn PDF document text
    • https://banghenails.com/upload/file/tesefibesetuzof.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3a814944c71b210f076f81bca6634f93/41980821510.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/zubavodujofapalotavefu.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/71296638150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anemia+linfocitica+cronica+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C6 15968 bytes
SHA-256: ded755a9e628000deab5d3a9ec30b285d22d172f7322ee1627f9b030babb9b9b
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10596 bytes
SHA-256: e16d751f0505ae22ed012564b137e9e853a5c29a92b32296ef60d72280f4281f