Malicious PDF — malware analysis report

Static analysis result for SHA-256 889470b7c95b3ce3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 08:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c9ad84e4736332727103c0f3c45a19f8 SHA-1: 51c4faee720195457f6c8910f034e6747bca92ae SHA-256: 889470b7c95b3ce3c601105422059f8f75943cb59ba8937872c0049886800313
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f9f2889f8e87ac3168f3486b31974665/58189972702.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070521ad1af2---78534350066.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0a69a533d---guwimulapadexif.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a3ec9ab3a6c49e9ee93d87a1c973cd80/7510168906.pdfIn PDF document text
    • http://kaies.cn/upfiles/210703031609425522frmpuo.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///wurinebugesomejametib.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/xikikokizi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/47264f95c3adffa2e5c4b6547aa3d0a9/xemexuwagurulamikararo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6c328d53f3a1b9bec47a1852903fa379/13546431761.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/42762549818.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/zufanikovaxevu.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/10501377927.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d7237bb29bd677641c5fc1911254d0a/mitemulisumu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b06af9219e---xalujedixezumowizibonube.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a30e6ac51b9---50292871063.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b9bfcec2a2e6393a377541f660ea36e0/kitilodomesopexesixes.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/4337620882.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/29894590781.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/niwesuzufivuvetiputeviw.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bbae638f5112368f2c64d83c92613bf1/zisesixuzeku.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/53206675939.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/zudobofow.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/pigesotavetoparamosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=operating+manual+for+spaceship+earth+by+richard+buckminster+fullerPDF 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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 17956 bytes
SHA-256: 9dd726db6fcfc0c09d94cad56e53d867c07de96041f729026ba3c7a39354fdac
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 11536 bytes
SHA-256: 051d051882ae1fab768d0ba32f98f9ef2826ce04c690d71368da48118fc5bb8f
font_02_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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