Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac51e61e150b69eb…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 02:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4c94353ea38b8a24eedcb98504cd8e73 SHA-1: 6b2182990c2f4bc7bbeefa68ee5e78b6ba100784 SHA-256: ac51e61e150b69eb4db698aeb32238b30b09e0aa0a75fd01710114075e0008f3
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of 'cmd10' in a URL suggests potential execution of commands or a staged payload, aligning with T1203 and T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://sgcaregiver.org/contents/files/savudaribidasizuba.pdf In PDF document text
    • http://fresh-j.info/images/uploadedimages/file/63490090802.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/26336583273.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0c7d7c4395177f2ee637acca2ef46a0a/98190015393.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/f1d67229f04bbd2e5307f41e04433e0b/pedagulatalovanadogome.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/j38c0n3uossrvcnnq296gcmd10/94013857806.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0f25bde82---38306888267.pdfIn PDF document text
    • http://novafish.it/userfiles/files/jabiweworisawudov.pdfIn macro / runtime command snippet
    • https://diphong.com/uploads/bupajelojolugopo.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lixutep.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bc450b70378---2735704794.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/witadoxot.pdfIn PDF document text
    • https://actor-conseil.com/files/file/76317066660.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c78d69dbc---xulojelefepadedegapil.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a072be114---nebazopenagefixutixosebog.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/220a59aafd73bcd37ee5444474fac3e9/74823936874.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/xuwipigigawaboteniwir.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/vuxibav.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503220110626252.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e2fb1c40774dfcf0fc82f83a2e942df7/26040069174.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73da66a906---11658277717.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/90049143419.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca06919fb---75315538907.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kojezedagaxotafizukijo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc14e601f5---23292013329.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=baby+songs+englishPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 10496 bytes
SHA-256: 8583962ecd5acec11c0040d70b469841406fdbd50c6e0aa633af09700de58f59
font_01_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 17032 bytes
SHA-256: ff97b59357b0e337c6a2489a2ac7d8b0feb00d569ab076a1f478050b5b8b3116

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