Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6e9f6af54087c6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-01 22:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddb274e8e44880e752fb7c46f7642c34 SHA-1: 033628be28c1f728f9652361c16eeb5c2485e076 SHA-256: 0b6e9f6af54087c697f0738970a333d77983d82b17d34378253929580073b5ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://newsru.md/upload/userfiles/files/13425376777.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-28/20210728055148217308.pdfIn PDF document text
    • http://www.shadowrangers.live/img/files/58574150056.pdfIn PDF document text
    • https://inncredel.com/uploads/40817172212.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28320057907.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/17377607265.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/xepomaxagizomelemavagufi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/mujiluveduwevi.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/fitexoruxejan.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/44367306989.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/86388396673.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a5a18177---wetolisuv.pdfIn PDF document text
    • http://ahchala.com/img/file/68490059061.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vubipamozinesubogunu.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/fetexof.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/xatomulupop.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/xebazof.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zatasanisepos.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f2119b41ea5b64fdd3b7c6667f29ed6/dazawujifaran.pdfIn PDF document text
    • http://elpijisystem.com/file/totitatumexerofirifu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/763d9884ee9e4b3a2621dd9920a8c106/butebajezoleteruriwa.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/dukovu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608699b9e080d---71481773657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pubg+mobile+lite+android+hackPDF 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_off0000c436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC436 10980 bytes
SHA-256: 51751b4c159b29047974e6781818a23e8d18025aad3f309fa560e8748531a792
font_01_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 22092 bytes
SHA-256: c9a0c51cbfce564b3c2593fb6eaec2b96a949101a7e97bdf2c52b67970761e81
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1