Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6dc3f55c594e0c0…

MALICIOUS

PDF

121.5 KB Created: 2021-06-19 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ad07371a29b71fcc6255456f20d27f87 SHA-1: c8905e7ebe18930c1a6040e889f2f34e4d11fa10 SHA-256: e6dc3f55c594e0c01df399f1df1cf3233705d3fae6e5b78d8fc6b9d66a82c983
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. These links are likely used for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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
  • 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://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607944039b9af---vadirupudon.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/2685685285.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d9d8c7e0d5c1a13bc412a56eef0dbbc0/39140304623.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6c239dc578c745ee841f54f586e89286/zipokifigi.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a500f1b281a7dc35959e4f1aac428c26/tosibe.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/nanakoguritorabi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9ff7814b---vurara.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7anjt9d94bca89ge6o0s4vaor2/nilarevabovenit.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0d6ddbb10a45d171e64320e90eeef72b/45782029019.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a4b56825---96251076916.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/89909163561.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/52bf4ff89e13e9c441262eaed53a9e8c/gofimejofukikideguguxeka.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f90fd4c5ec376e65508c0b21608dc209/ziwagudubekapukowisajak.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4e9c88e1204112af2c37035c031a0aab/84851781960.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ecff0609---94886637520.pdfIn PDF document text
    • http://prmakeup.com/Image/files/lisemuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=meta+gs+build+mhwPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dcda4a399c08c02b0381fa574ba53585/91387055734.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E34 13492 bytes
SHA-256: 0e4d75c1469cdb1efeceac0ee58342fe5e8c0d8ad0603615d678bc9e403a23b1
font_01_sfnt_off000198e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E5 5380 bytes
SHA-256: 64948f8c611c6856b00b36cba5db8ea829c25d2862a25ae0e66e2eabc4a9144c
font_02_sfnt_off0001ab25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB25 13584 bytes
SHA-256: 802f40f7c9065398fccd949b49bacc0dc04a32b76ab22c024e5d92bdee7753de