Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e561bc725d0f9ba…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 02:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 026a04e3ce04d3ee8715f660ab85c2d5 SHA-1: fe6184d909d982a9b89550abc42bf21c3d0af1ca SHA-256: 4e561bc725d0f9bae559c0ca09e2890816e11b28edaaa0e3fd344734668194ca
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a4b1e685---semosopato.pdf In PDF document text
    • http://kristiankutschera.de/userfiles/file/wekuwifiropu.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/gaxefavarujot.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/81428372483.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf7bfa224a---2703182847.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/duxusetowuxi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/79421603484.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1629633805.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0ebcc0fc---mazeguzamik.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/62705538387.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed4fp1hqespjsc74c91idk95rj/22832545889.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d01a8544---zimoxakopigemafomurejis.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/68213185722.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/5b5f1ba1278e3a594562c5d271dd50b1/58615579618.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f8b13893b---xoxuzo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jotazopelugefitisarekojo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/203fea5f34571b504a579cad97ea55c0/18836667395.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/pojomoxevilalakefowili.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/dusovupimelujezudasanadur.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/tutekuzedasesikatamiku.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/nubetebewimesometavozoz.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2i2jnmu6q98ecl75bp6sf9v944/30903495624.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/wekibofaberonaset.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/fosopirazofilakekuj.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88445246309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=have+got+has+got+worksheets+eslPDF 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_off0000bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 10424 bytes
SHA-256: e98da13bd977dfe396a2dcc009efe328f58364abaa352503041da00ac4833929
font_02_sfnt_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 15448 bytes
SHA-256: b1e39dd7b0a1cdf37ccb17eb52c9ab02a5b1ff892e8fd694227a703ffbedfb6e

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