Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2d1a370be41f49…

MALICIOUS

PDF

79.0 KB Created: 2021-08-07 21:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: cd5950743c5e09ebec42f8ae2fc13fce SHA-1: e338c63ce08ccbbeecfbf738a77b58ce510fbb67 SHA-256: fd2d1a370be41f49bcde4f942b4b3685c0bb0201d1eea206d6d456c4e83585bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm that directs users to multiple domains, some of which are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or redirection scheme. No scripts were extracted, but the presence of numerous external links points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://signexpowholesale.com/project-new/christianbook/upload_images/file/furizagadagitexu.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc603a81ed---pozejasab.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/ginabivajibifikebotezepin.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/viladegafenisobimo.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/kavuvasixubaziz.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/25383918684.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74eb99204---ruwigukaxexi.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/59184904038.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160854c3c044c3---jomisotodidatuxevupira.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/gimavuxofokojas.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4640921419.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/kefilolamexemeduzinuwen.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7df4413f7d---80058903459.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075b0df2ceda---jilefedumigoj.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/7bldfir298r1uvluma96b5ip2c/vuwezakefep.pdfIn PDF document text
    • http://arablift.net/userfiles/file/dekolisejab.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mefajabawosesu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/maxawodaw.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/429f9d0715b68a3f3917e14e6c9a6dfc/noxazufedegovixezom.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k2r3sgv4o4r10udqo3jbpnk796/zeroxekegeboxikogik.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/72906114196.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/revifezo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/078b2b695f720fef7c89b72f4914676a/mumipuvigovofezom.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815a22eff62---12838766254.pdfIn PDF document text
    • http://18554080.com/userfiles/file/1512990522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=five+nights+at+freddy%27s+3+unblocked+games+66PDF 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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 11788 bytes
SHA-256: 13f76fd8f03aa0dad27b2d6e82cb7fd83f116cbdb1485706992f2ffa3192d1d6
font_02_sfnt_off00010254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10254 16532 bytes
SHA-256: 279c5049d33e66380f02cb595feddb4642dbb374c78ff65f3d84fc38c496a569

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