Malicious PDF — malware analysis report

Static analysis result for SHA-256 640276028e9bccc9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 05:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9981ae74121b46c671764c45500b213c SHA-1: f79ce62fabb540d627d650b2ab953f9c938e1bec SHA-256: 640276028e9bccc9cd9e1796f33ca739d7606ed3c4f8cd594a159f8e06bf62d2
156 Risk Score

Malware Insights

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

The PDF 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 WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to lure users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948391677c3---bajipavuguzasadosaten.pdf In PDF document text
    • http://poltinka.ru/userfiles/file/26856279046.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/73125702333.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/38a0a6b04782a3fbabe7292733010797/jerutuxovonog.pdfIn PDF document text
    • http://leguido.net/files/29193599537.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/44776827731.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/54318453936.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609706bc5584e---38514652347.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/goxizopusokakemobudivexo.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/28099477923.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41328415072.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/84768743144.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185f4373a4---69702518665.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c98ceafc6---87341113409.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160789036e35b3---moriledogomisogiz.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/simibijepibanivuwop.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/95002926366.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/felamamejuxapegibusakesu.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gejaza.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ba0280677---81813263935.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/gokuleweranidejinesup.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/dunevexiniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=basic+english+grammar+pdfPDF 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_off0000e7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FE 17628 bytes
SHA-256: 5943ded4055948820a43c4eb5f6d5b1912416fdeef384488509bda061c49a45f
font_01_sfnt_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 10900 bytes
SHA-256: 0ed986e81a444376696db3d8fe97e701eb764d3e44768632bdedb027e7d9f706

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