Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1a2a7c99890926…

MALICIOUS

PDF

72.4 KB Created: 2021-09-05 03:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: edd9e6f1f23e837531e99b99f4451b93 SHA-1: 7fa29a32626c76d3c50255f68904e1d73a7c12ae SHA-256: 9a1a2a7c998909261920b158ec338ead9b936e822d612c2caee7ed30a266ac75
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 0.9965

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6ee5fff23aa6a015e01caa33d855c7e4/38739050984.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737d2dbd5b4---25063733014.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/zotozimuket.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/lusilukijanen.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/xudifikedisapafarefi.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kibuzulepapadabixotuwasow.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/94001205732.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/8lb9tov1t3pupcnb9dd706590i/birupafafewasofuvofilan.pdfIn PDF document text
    • http://scarpatti.com/files/98564044694.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v50o4itqgsrv4oa23ofocmlv7q/55439275316.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0eaaf481ea---rivir.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1058880c3d---pifoketugelezewexet.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c525511e9d0c80422200107096500e6/62975390641.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/nivaniwomugiligiresapafi.pdfIn PDF document text
    • https://eslms.com/userfiles/file/12421224246.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/zikobenitonaruzafivapu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088692701db1---19301107590.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/gebetusubop.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/buzaweronisade.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/mirapexa.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/1622481956.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/5935d64f83603dda8fd602cb443c262e/68440414432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=negative+effects+of+social+media+on+society+pdfPDF 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_off0000bb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB92 15524 bytes
SHA-256: b36a123f3b744252239b14250fefe1811e00986398be812d21fe0f78417911ac
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 11020 bytes
SHA-256: 095df0908d6e8c2a068264a936c3b00900e6c309b5cc98f0b7d26e1d041b3d31
font_02_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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