Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d76b990739341c2…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cde051f5b73b99eeaedc1915f3ac4561 SHA-1: e1f265ea6f3150e4cbbc467e36d3f61633e32777 SHA-256: 6d76b990739341c23ba4e0ab6d6b0894cea26c98f1cb4c946dd13f0a8e7ef132
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. Heuristics indicate it functions as a link farm and a callback phishing lure, attempting to trick users into calling a phone number. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or scamming purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/na77j34agk1fd2gdkghra9eqp1/gowuladat.pdf In PDF document text
    • http://immobiliareborghi.com/userfiles/files/82883552324.pdfIn PDF document text
    • http://bunian-co.com/other_files/File/goxuruwobevolenubasus.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/59832367413.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kilokukafuxinevage.pdfIn PDF document text
    • http://3sdent.com/upload/files/98950100003.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/pevukidefafax.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/53194979653.pdfIn PDF document text
    • https://lordoptika.hu/files/files/36434609903.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662935cb14---bawuxafedigegajebixifoz.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/50349727327.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613278c33b886---40663120139.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/falinujef.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nazakikike.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/juguxiwesaponezobogabe.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/vavubozovugonuweturufe.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tiritalikebinogofetunolab.pdfIn PDF document text
    • http://zl369.net/userfiles/file/59799224591.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137058aac99f---88495718040.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/26240398590.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/59995718253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=galaxy+s8+vs+iphone+12+miniPDF 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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 11020 bytes
SHA-256: d1d8cbb027749bb09f92b3fff88566aae2ebe074a49001668846c63d30ddde81
font_01_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 19824 bytes
SHA-256: 4ffb18bc73f226ff253bfe472cd028d2879b6212ec50559f0a037a657a2e3b09
font_02_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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