Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e21b6a7e32c327…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 06:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0554091824c43df39f0673e2cbbf259f SHA-1: a0f5fecf83479c55780ccb025eca94e686c29383 SHA-256: 15e21b6a7e32c327a0f8f7f801dc703411df64d97481cdd9197778ba4060dd69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. These links likely serve as a link farm to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=types+of+chemical+reactions+worksheet+doc PDF link annotation
    • http://utuin.net/files/fckeditor/file/17282126959.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/nufegevuka.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a422aee7190---wobedabowam.pdfIn PDF document text
    • https://eternalbliss.net/file/28091966067.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0478199fdddce4d1b049837fcbc383df/6751412265.pdfIn PDF document text
    • http://aven.su/userfiles/file/24813811565.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e063ead3b---gutulux.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/63876219201.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/jedefupulodujexis.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071577294334---potukugegijewozavinej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad6ea48c91---woduja.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc81b21b3b---26541139278.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a00546c74d8---65325041774.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/17b82a7f4b5b4e3c80efb9ecca015ef4/filabevurasalebedibajo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609c2d5186201---3554804018.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/luhr5selbsvfcir32h1k6dvs6b/90497388795.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6599b53b12dbd7511ac228f5491b62a4/vibagetukidaxolofumob.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jobovuximuxulapatiwotis.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/babafafedir.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97150f8d0---49794362493.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8c013591---kuxesapeju.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/44991081801.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/10710492249.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608751b56dfb8---91253489134.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 17876 bytes
SHA-256: d191d89d617d98b21cd4345c42064dab4ba9b1e4fa285490c2d8b7f828395eda
font_02_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 11140 bytes
SHA-256: b69a8ea3f35d4b8ccfd5bf1f03959db9737f9817c745322837653a3384a0483d