Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3de32ae99503ff…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 09:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df679002342d6a1482ca0cf512b6e679 SHA-1: d3bbc012451d610e74bab85474da67511c7d03b2 SHA-256: 9d3de32ae99503ff03acd0f00f3ea8277f1c919873ec0ac1e40a430b60c259f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of malicious activity.

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 http://divapharma.com/uploaded/file/silozipanamavixibozeter.pdf In PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/66144721899.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/91754065007.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/84461355044.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a77351f15cc---62255900348.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6b6d418a---zuguratazepirukogizasi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a165d1ecb---sojufuma.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3957251b20---19892061989.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31e49e9782f7e0c327bd78c61166ab2b/3574032022.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/58490947395.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5a209a86b7dc80367ab1164a7a34e726/didofujagimogumitija.pdfIn PDF document text
    • http://mobiliteit.nu/files/siragivorizogu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4c986cb5---mizamisepapabono.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3e9a132fb---zanedojes.pdfIn PDF document text
    • https://noddy.nu/images/file/27676267644.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b571227ec---9409598391.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vrj531tob1g4heat8rjspqfk9i/76618918544.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2f7679631ad52389708257a79ae87c60/1646251481.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083265d50657---borowowoduridunolubelom.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e78287ce---28606209983.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774f562e925---puxidixotewakaferej.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6mj9rl70a1cjcntntqg5lr9lcq/zevuj.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qmkdh7mtvk7fc1vgvapsbh03gu/mepumavoresomekegit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+you+pull+a+hip+musclePDF 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_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 16460 bytes
SHA-256: 4a1de5431e11efdd665866676132be5324a60dd4f597c1bf430d24f8af562b71
font_01_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 10688 bytes
SHA-256: 5575aa1472da881627b1f91e3ed1ee79892dfb8f3265b590e318a4cb21be773a
font_02_sfnt_off00012e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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