Malicious PDF — malware analysis report

Static analysis result for SHA-256 927e3ec9391ced64…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 23:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5d4e6b75642aaaffa47dda9629e8421a SHA-1: f4a8472d25a51da906e439dd19fb747e7edbedb4 SHA-256: 927e3ec9391ced645b9883e63ef83e8d76550ff3a97927d505b1506afe6a36fa
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926d76e729---duvim.pdf In PDF document text
    • https://groupunsur1.com/contents//files/nezufitimed.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210624041446138.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/upa9cdqoljeersgtvjr2j7vl60/gegosizulogavu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf7852bc1---gikusuwibow.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc41d07afe---lugane.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cc3diias68afcgsq3v7h68o9g1/varinexegujawebalokib.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/847ae4536fc475ba299c4382eae2077c/junujipofemofixonapuselon.pdfIn PDF document text
    • http://contextuae.com/resimler/files/66552479492.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/954b80bngftehqo8qb8i7kuape/58398776584.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46faecdef2---zuruvezagi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f50f05cd---xefapawomofutusidime.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa299690721---9767684814.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/84897613993.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/sizatozenodojorukozipo.pdfIn PDF document text
    • https://hirurgija.me//files/54554074738.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f67af9b3---bodasuwovenebelosafo.pdfIn PDF document text
    • https://atl-50.com/files/file/86763174722.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6e1cecde---guxutaweluzun.pdfIn PDF document text
    • http://yilip.net/userData/board/file/dufugadupipunodefujudube.pdfIn PDF document text
    • https://aedwea.com/upload/foto/66094892223.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da8202604---tujefi.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/zesuzosikirutudubaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=thirty+days+notice+letterPDF 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_off0000fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA23 10544 bytes
SHA-256: 23ef3c3c9bc41097f7f0ff2bf43689e8dc006de40f1d12d824495d85e0345988
font_01_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 17072 bytes
SHA-256: ab02a08616f4808e9759317f5076c7e31d7daae63a53c4a2c26232dd7cf7ebf6
font_02_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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