Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c0a7b0ba3ff9dd…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 12:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fb1534fc01240806c418a3f17fe4d83 SHA-1: b94126303c23233034d6c6a0f9cb0b64841c1bf1 SHA-256: f4c0a7b0ba3ff9ddfb67564119edb52ee9a75a09d79a4158ee3e27525279ad2c
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 link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=back+button+app+download+apk PDF link annotation
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdfIn PDF document text
    • http://belean.pl/userfiles/file/55121881146.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/16555225572.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/lovedowodolimatirupojora.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/4ejqevtn7ge0usiup6mc5pqpd7/76461608436.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/10216502015.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/acfdfecad3738539d371a0ec05cf217b/masufodivakabaz.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/74809620010.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/77009566533.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/betomesawo.pdfIn PDF document text
    • http://gibisch.org/files/files/bufadixiwajaxop.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lno2u53vedr8v8sis3jqmoh0d1/busazivapiluwivenor.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/zaniwolazonogekimuva.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/45944767928.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/47152014772.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32b82f45344c9b54c43f5c0752381015/67437130813.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/64587914914.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16139a32c1c046---tureju.pdfIn PDF document text
    • https://salwangurugram.com/files/89653706939.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/totef.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/wuvuri.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/72586776356.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/towutozefewaw.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_off0000c85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85B 17084 bytes
SHA-256: e17b8170be60066ee9a5dc0f9af40865a4afe5b0eae72aca62b2abdf686bb630
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 10484 bytes
SHA-256: 3e0c78cb28dd8f1930629dc7db65ed488a4cfd20e3de3bb048df1a154ac7730c