Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9f310f1c1408bf2…

MALICIOUS

PDF

96.9 KB Created: 2021-09-07 22:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4805fd1ca310b89a595e1478446b6c95 SHA-1: 52b167b62074c10f320f91935bbf246a784e459a SHA-256: a9f310f1c1408bf2bad8b63fc5b4112e8b5b9fa6002c31273b4e83989fa8e636
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. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://pixomot.ru/uplcv?utm_term=health+management+information+system+book+pdf PDF link annotation
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5jha190m7bj57l0isd80kh3tr3/38730021619.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/27972480380.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/84758937275.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3d4ed2b56---tijedanuxesixedovonu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4e2e9630d19ee861df008ef1c0bcdcc4/zuwinapiwikelete.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/16674944785.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a15e13da234792b6bc30b7ba3aa69dfd/64910797514.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f073e5e4fe---jedufuvax.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608617b6a6546---66543859504.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/zotenizafexevamonapuz.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061013320380554.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d493375ffecedb39714711861fcdf8fa/5385357683.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/42990879581.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/bupisenomomit.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/73316810570.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/nivagamujivad.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/36097395123.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/37291598860feabc861aa3.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104835cec939---60775768881.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c059fe4aec---11602490334.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109071655027575.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2fda2dd624fa63c66d1913a2fcc48e00/83979856723.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3fc390cd16ddd0d9030d84c3f0bef251/redamirafegupup.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/42992153595.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14189 17736 bytes
SHA-256: 2880ce6de37278fd39319429a43e07190ead15ee5c73616037981391421c9858
font_00_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 17196 bytes
SHA-256: 56573fbe7e2d55e6e749252efcb37149ad4fc114ba2d0717da37aedeb7340768
font_01_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 11280 bytes
SHA-256: fbe94a332ed617e6c704d4842554d1a4686e35081f6296b9479a15f2963491de
font_03_sfnt_off00015cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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