Malicious PDF — malware analysis report

Static analysis result for SHA-256 253715f0eea07993…

MALICIOUS

PDF

85.8 KB Created: 2021-07-29 23:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b50bed1f42571a0890af97fd1fffd5bb SHA-1: 52ef4af05483011cceefbcd9e85bf86d2fdc0e46 SHA-256: 253715f0eea07993bc812cc83d3166d06e77f6b8bc4e5588fd9112cab2985da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://izometal.net/mm/file/joredilevezokexegamu.pdf In PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/bitokafeke.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3691a9c61abd455a6107482a32920d42/muninuzajenixuvasofog.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/jadigawoxagu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160858874a98d3---wuvipigoxagox.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210712_211648.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/12932065704.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/69403631653.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vujtvrmjekbv60iffj66nc349b/xipoj.pdfIn PDF document text
    • https://soltendance.com/stockages/files/9656202473.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d834593d7---60170136143.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4cde5705---31205178987.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/35027136107.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050319431815.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/fifitisusudilenadoz.pdfIn PDF document text
    • https://sanagustin.cl/files/21425697945.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/49515689559.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/nokoragunapupikalujof.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/18ae6841dd6325b33525b862f7d2a220/sozemobuwagaxujos.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/75b8fc8ebd3d552d94bb54cf342d223e/tijaxupuvufifuzikazureba.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/wimunosewononujer.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/86856843235.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tosavekofufisupumiv.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/66205918318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=certificate+of+achievement+pdf+freePDF 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://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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 17196 bytes
SHA-256: 269a7ae47f8d7e2d44f527097637fb5568e561fd76023b1723cd2e0c057f59b8
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 10768 bytes
SHA-256: baaf3fb2989291064912d09a49130a283d0112b4fe1949011f6e5a8ce0559a89
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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