Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acf3cabd2b54782…

MALICIOUS

PDF

82.9 KB Created: 2021-09-14 14:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e288c4b48db3152ac6d9e1c5093beddc SHA-1: b02c3bc4e0893ca8a9b29c1d553b41898100e3c8 SHA-256: 8acf3cabd2b547826f46eb63b84395ea8cc55f20e45cc2e2761fd0b3a101af0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=galaxy+tab+3+reset+factory+settings PDF link annotation
    • http://irk-yoga.ru/upload/files/rekavupofoged.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/38089740501.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/25920652237.pdfIn PDF document text
    • http://nenorm.com/files/files/xisinat.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/lefazogusezigudat.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/51ed121980dadd0c81ef305268f4ad05/wazagetoge.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/26715544305.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394ba93250f---82738953970.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c7988e9c0aea85bf0e1bbbf675f58128/fagawatuwukunanaxe.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/5411389860.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/88495258212.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/fakikifir.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/16187178115.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/xevunatatetalawijewa.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tizisagezoxop.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/75288795615.pdfIn PDF document text
    • https://angem.fr/userfiles/file/zarafotafotupikoguzegenip.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lajolewuxuj.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/72731576751.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/51141512458.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb748a664---63312144633.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1227119be930cccb1056094fbc4831ca/kawamuwonuburodobebogalu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/ramitoforuzapa.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/6966889865.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/mupavanivilabifanelewag.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_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 17256 bytes
SHA-256: fedc59d31b0aa020995edc1c3abeb4b2e51a6e9c881a3d8682c45132432b24d3
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 11076 bytes
SHA-256: 2d53bccdcbb7d92013addf4d4d785284df1969c734fc6e558d5cb54bef0444d8

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