Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d210ec21295df17…

MALICIOUS

PDF

91.9 KB Created: 2021-10-05 21:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 190f84e521a91d8ff7a510a90e37529e SHA-1: 76bcdd53c567aa20da520d81adc7c58de33dc438 SHA-256: 7d210ec21295df171aae6cd86f040367eeecab632eb0ec142e4f45c706ef4cad
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. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These URLs are likely used to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=persona+3+sees+armband PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615644b1e6a45---42523637850.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/10667162279.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/10638976775.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afafa06f05---82564439910.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/labexutixutime.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442ce8b90d5---23548004257.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16136e94b9a220---notowevomiravo.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/fibirikixet.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/jukipipotixid.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109110006598400.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/47601492981.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xupubinebulorajedo.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/5322292905.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/80511940037.pdfIn PDF document text
    • http://nature-revive.org/files/file/jivepujuzagav.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/mowutajaj.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/14d39f11d7fb437903388266a545386c/gawuperiwivotadomi.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/lulexudoxisafamoxi.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/38777628201.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/29581695254.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/48643256654.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/vogakut.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25a6c0ea7---31420926174.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/80291717204.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7277218ab93695477004a95de886642c/zefoxikewigigovov.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_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10484 bytes
SHA-256: 685a36f583f02aeda018d94aa99e3e34c8d1a59f544cc9266f9166da921c0b03
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 25640 bytes
SHA-256: 951a24bfe0901bf159e11a856462596491d198176f2dbc13b2f1aa978d360424

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