Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce57abe6b13ed4e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 15:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6da85de44bb1c986daf96ae6c89a2406 SHA-1: b132ae49d39c0e475f16ed81e29d4af991dba83f SHA-256: bce57abe6b13ed4e17c40fe869a61d4255f7c4fef756e5c877fd0f9c776cc995
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=how+to+download+files+larger+than+4gb+on+android PDF link annotation
    • https://sofupingame.net/calisma2/files/uploads/bijadapuzanigizuj.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tedanipalivulofesuv.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o7oadkfc4h9nq9oqi1447a34dm/janaxexixadepijeve.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021091103324973499.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r51hp5p334vi2fmkp11panqtao/78244211069.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/punimupawimefunim.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/nowoteromata.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kevuwozupavokogenoxo.pdfIn PDF document text
    • https://conrays.ru/f/data/gutuxa.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/gixodumokosido.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091519313325538.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/31131208177.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16313896721206647738.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/jizepolubimud.pdfIn PDF document text
    • http://strandedtattoo.net/file/mutowire.pdfIn PDF document text
    • http://adveotec.com/img/file/54616524799.pdfIn PDF document text
    • http://precisao.net/files/files/gekusazizit.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/45306174843.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16146b7ab6137f---20251360157.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/rewotubufe.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/52949061707.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/sizezerezadobuj.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/dofuzixunikikife.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mj9kvtauua5fau0rn2pf7ccs4s/13459989277.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/86295026453.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/biberowalarurelag.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 17400 bytes
SHA-256: 563674a8e67c39559a31a955827bb4a59f016991f3e9df1054b0ff8f7fee995a
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 10928 bytes
SHA-256: 92a42397d20e034e3d841f9ae356a006dc1f441c671adae3edffce0276fd26cf

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