Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cb50b700932544…

MALICIOUS

PDF

92.1 KB Created: 2021-08-18 04:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7f14da9b06f48a469de4a37de187b4e SHA-1: 62e31525d81c13348ec239c6fcada37a26627122 SHA-256: d8cb50b7009325445b68599f62e390b69fb61cb721d05e6b79a873ef98ccbb75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=the+drone+racing+league+simulator+vr PDF link annotation
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43690a5016---gifizepebiwelo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb7a4ac660---ledamodilasujubofuk.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/71824764758.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/medivewo.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/42125099535.pdfIn PDF document text
    • https://hagepoorter.be/files/files/39049580036.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c1fabb2d451ef9460f0e0eef244eb806/15786966788.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/wetekawufonamafiraxefet.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb9d91c5e1c6278a89a92447f25a8f1e/54491218471.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/51982822786.pdfIn PDF document text
    • https://inks.bg/userfiles/file/678222617.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d2bfb472f8d536c0479b7509e5f3c3d/79353501550.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/d6q3vvars6phvg7mrdfa8cdtbv/65200399619.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7f96b2a7affdef6323fc18057636da9d/taxefidulunolofariwuz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/xisemo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/fa929ef5173ba05d8371d5040f25f823/41447833287.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d65b021bd458fc017fde1c053180cb68/84578891285.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b0f140039f5eadb8ddf71e535df9d366/43073200285.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/maxojesosumawobo.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/73996825474.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/18613932489.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9311c9ca---rigigoveveguxudafipet.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/17567223439.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_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 10944 bytes
SHA-256: f4291a71931c5407ad71f2936dd6342d4823b593b507bb3dc98d2b1ae3d92aef
font_01_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F7 17428 bytes
SHA-256: 3950c53e070ea455189b1b78586a56201e32dc00670b5c62926fab3aa3366e45

Open this report in the interactive analyzer, or submit your own file for analysis.