Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ca5870cd04e6ea…

MALICIOUS

PDF

101.1 KB Created: 2021-09-04 15:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8119122fdae43a379b8e15f89b610b15 SHA-1: fb9ccc1184f2f782434ea14df4a5332f49e5af3f SHA-256: e9ca5870cd04e6ea903689542fe9dfc4d74450cddd856727d3fe36c6709d685e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://provia-events.de/pics/fotos/1/file/zomosurovusakomew.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085f0ed521---roxusitix.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a7296f3dd7bf4a5610dc60eca02f05e5/51170138483.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87097e79deff4d9b3cc4ae0b8a63a72c/munidemuxafokerom.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/o0vckitlnk8khmcbtngscvmuv3/12469305451.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d4227c08a46aa1ee0cd2ccb2ac784fe5/fodolewudemubi.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/5ce597487da6402b68e31e117162843c/nalimajejiwebe.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a175d256212---furaxudigijunuxabajun.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f507a56782d7c3ba82ef2fe12dbd0634/linolemajulepoposuti.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e932a9034d---5665988076.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a45f98c683---rujaxemomigawopewitud.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0280fd692beda6c884ade47ea8a71213/61159353511.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/55925754823.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/keworosepepo.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/nukewewedijudero.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lavotukavedunedun.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/22310280731.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/30814127992.pdfIn PDF document text
    • https://anjingliar.com/contents/files/karaxodomilotuzupowosak.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c192b4479f2---zukagavawam.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/67aa7a88bfbf4065f91327d488b31c14/fubosazo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/raxogigevenuled.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+originals+pdf+itaPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/purip.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://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_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 17892 bytes
SHA-256: 83af7016e56bf3cc2ef04593d1cb4464f1eaf22eca2851c0a6bf482c2acb0b5d
font_01_sfnt_off000156ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC3 10740 bytes
SHA-256: 8fee76fb531e0288c305be7258c9362f4509bb28c7fe2eb8b9190ab6516b6119

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