Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e411d6353c1450…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 07:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d20074c4c2f4356a56c8995eb392ef8 SHA-1: 7844da9279dce7dffe0310d91d093e86be4f4efb SHA-256: 16e411d6353c1450772221eadf56338c274e26ce5aeae0053af7af4174708e2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=gift+card+code+generator+roblox PDF link annotation
    • http://griesvoegwerken.nl/UserFiles/file/21129491826.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/pabonofobukusuxi.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/10424667229.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/54665034715.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146680730024---92500984486.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/734b3565cd156b4b132e9126e79e06af/33903432868.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/1896501953c5b9d1a58227c914701e8b/40091065605.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/nufubasekekekuderaligoza.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109111319299885.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/povutotoku.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/3421229166.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/tozizozaxuvusasezu.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/zamoviridomiv.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/tekodape.pdfIn PDF document text
    • https://netlandschool.cl/files/xazim.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/32627828902.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/nirazigodidozibazufosezot.pdfIn PDF document text
    • http://trovas.com/userimages/zedavunagomoxunim.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909101416_NzYzNDU5OTA5OTI=.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/sezizafotulotosinakiga.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/23411504329.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/81401846347.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/remozoxunemuzesonegimavo.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45579862753.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/43062604921.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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 18704 bytes
SHA-256: 8568daa1e589dc08d554ef846847444318460767f133a8fb5328963449bfad1f
font_02_sfnt_off000126ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CE 10764 bytes
SHA-256: bc0a80522a678951876f7f042887f75defdc3670ee57359a7e0be11323968dc8

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