Malicious PDF — malware analysis report

Static analysis result for SHA-256 32ad84a2bb1d1ef5…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 613db5e9237cec3d75b76e090d95c8de SHA-1: 837da16b77209953c77b4d658ffe9e646dd656d0 SHA-256: 32ad84a2bb1d1ef534596ec8c5b28e6f7951999ee22abba7c5d981468a8b62c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms. While no executable scripts were directly extracted, the structure suggests it may be used to redirect users to malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bioscipublisher.com/files/upfiles/file/37978242710.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021060821210411.pdfIn PDF document text
    • http://geose.ru/userfiles/file/belofawebusuluwukafozed.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/50386658472.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210731_2080357D547F6534.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a052424f119---58245280630.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d85a91eb70---22849266701.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee9430c4e4e---47981123504.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b27265a06f---pulozisumo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a73bb613b6c---95949151350.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/71758808194.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/31c7770bfad3c6e3adfe6a69b79f98fd/dotutatebes.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d878b9dce40686bc047aff5a8134914f/42886248207.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/48db791a8a738d65f1da39c6980219bc/90294061972.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea9d746b8ca5e3117ffc82f40cf68eb4/14545536804.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vebarovadekasimebagotegos.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/wixiromesa.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/gokorotutitevemunikeb.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/wepoletifux.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/63677886936.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/gobibakiror.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6ca1997636c4ee383cc8b720a408d07a/43255769504.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/pigixegafi.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/24817265443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=literacy+worksheets+for+three+year+oldsPDF 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_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 10720 bytes
SHA-256: f74fe62e5ba18c8b1fb1b064b87445c986185669cf573077baba0c58f4606c39
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 17816 bytes
SHA-256: e3c7586fe851d553eb0857296060745584f933dc9795ca1e804fd34ae1d534d1
font_02_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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