Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fc67d7d3fdd6c3…

MALICIOUS

PDF

79.3 KB Created: 2021-07-28 09:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8d251f579835eb8e8667d6f2a8df2c4b SHA-1: 82215c13c52d0882a74b260ebdacacf54e555603 SHA-256: 39fc67d7d3fdd6c3239b3aa93c119e0917c98be4e9e432ff6a94d8dfa450e5f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882c4e937b---67758244127.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcbec7e64c2---kisofadikesasokumobira.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160821ac5425df---mawedakorur.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/22b7a29f1a573284cd76cc62e024dc31/12947662844.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8d89c34c---vuvaduxinabogaf.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/69465475832.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/638416cf5c13d6edf4ddc22abcba6cdf/guxifexukoboturuzaxas.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc2f01ef19---fituwaw.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210623114902.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160fe296a4afd6---xisunofuruxidas.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763f59191fa---63417089099.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/9qs03146lam0jgqqeibrfr0q7u/naferomapim.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff37ee31f45---95988327543.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fb8ca38f53b721fa13f65e250c33c293/dijefodifusejavazufawi.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/18009924594.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160834f98a970f---19953281953.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87cf2584e6---88128913046.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16080964978e95---pivazenululevalogofubib.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/judizijemekopalusekare.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5ma3c515q2kldl89sjaldhj71m/ketetemilubetivoxepinibu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8645899495---48102791996.pdfIn PDF document text
    • http://riversedgefm.com/files/file/80864276023.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/2990e3bec643d35d497b1259a469610b/81894107007.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/ledoximoduburixosimamuv.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078534994a84---48425801509.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ofhuvt8s3phpqs8soqkibp9kdf/jajemijifadozoxuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+hero+s2+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 15580 bytes
SHA-256: 10797f43cab255447dcf116ef4e8e0a7c5eba28e70d5a32eb842627d19337b98
font_02_sfnt_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10628 bytes
SHA-256: 810bd4fd45ac636e8a5d4d34462e9907f87ee24bf38a32cd6a80fa8cc48ccea1
font_03_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 17468 bytes
SHA-256: 8435ec26040c8e9aad5981f2e9331320dfa33037e246446cf98398a0633eca2b

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