Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a459fc8dd1106a2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 11:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc588d3b07875add28303b4e8c9a2ae9 SHA-1: edf455d1c9b3a34b1870740c3c1234e4cc09dd67 SHA-256: 6a459fc8dd1106a26cb9e278e33b0439d17d85c034e80c0fa8ce60f4b68bc12e
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URLs, some pointing to compromised WordPress sites and IP addresses. The presence of a fake CAPTCHA heuristic strongly suggests a social engineering attempt to lure the user into executing further malicious content, likely a second-stage payload. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=aot+2+apk+download PDF link annotation
    • https://vientangluc.com/upload/files/tabofavevuzovumazelepizer.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/morabajixezibo.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/faxumoj.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/63643231366.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/51807982091.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/68484254322.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/91f4d9b41d11c887c473dca8b40dda88/48056255117.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021912257265992.pdfIn PDF document text
    • http://skisun.it/userfiles/files/65512832657.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/40490277232.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/dubojefejujotuwotelo.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/40314617464.pdfPDF link annotation
    • http://vertracapital.com/uploads/files/92709463983.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lapumekowasovadajekide.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/xijat.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/11162328068.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c81b439fa---gunolagonasemibabumodoxu.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1240499625613e33b36a881.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/33470765559.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/zogudiroporimejokakelis.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/katuwuresomutuv.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/fovivasodisa.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d292c8c---51772042992.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/baxodelewasunidemaxujela.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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 10172 bytes
SHA-256: 45b39f44afa4d7ca6c0304dab8689d344ca1ec735a4bd85b1cfd09e0c715225e
font_02_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 17324 bytes
SHA-256: 74f3d25134d4aa7f7f142cf0d91f2ff79b91a953a5e2e50a5c19f46e5c1f62fa

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