Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb1df8b9533c28c…

MALICIOUS

PDF

116.0 KB Created: 2021-09-07 22:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11679847bd5434eae3ae17c90afe49d8 SHA-1: 879592b37010c8087ed32ad6d656b3ceb0fbb2f3 SHA-256: 9cb1df8b9533c28c999f7cc970b81a655dbd9695f8f63141764918c5ccfedd7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=jurnal+tipe+kepemimpinan+pdf PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/neuj23uqs1deqf2gb6r161u6pf/zukibosafu.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7cfe6aff6---gutezag.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63aeb32f6a---vanuwoxubivuki.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ctqk1v3thk6ddsphg46j9i5gda/93880509821.pdfIn PDF document text
    • https://agatanorek.com/files/file/felofefididomibevorajod.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dd3c55eaa---63325596226.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9353138c---11404153992.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/wakoza.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160779a62837ee---63123553065.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/23898655274.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/888b758a905bfb196dce1527203d8ed0/tetutatexaviloxemitodem.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210825_AFD9EAAB72ECA152.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6790932021443fe46b8a1e0beee77864/kuwaredopukifazisizixuze.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa4ebb372---59410006349.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ede0917d---galagefu.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/lv8kuk1hid4civr8ld1lr88iqt/niraranusuladuwo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa835e38ab---1844204749.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/peduxometigemadaj.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fojazifetafilodudutuse.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/kuzufofevitesafemo.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/na7tu8meqqul9lc2hi4tsu4pf0/55514699921.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vfjo7osq7qdd9n2jamtb148apo/73332935466.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/tizewegaro.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/xaleluwemomugowajet.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/e6a69a6ae27ca67a02270debf77fd72e/tosurakubojo.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_off00015d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17536 20200 bytes
SHA-256: ac2a94c66a39e71e9b6eeb3e0c167fa70d81861beeeb077ec46ae5e1394c53ec
font_02_sfnt_off0001aa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA29 10556 bytes
SHA-256: f7a25b54aa7fff74a12faaeb87af3bbdedfa8d7d405fbf705640e93f0f858a1b

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