Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93d0053f1ac1d86…

MALICIOUS

PDF

100.5 KB Created: 2021-10-05 18:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: af302c2e65c64a0672dfc5f413f77d60 SHA-1: 31f34c5f5cf815c57e38463cf9872def3679d491 SHA-256: c93d0053f1ac1d86fc70a750d270bf1321acc1e595e04c16c0eb30cb2cf658b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains numerous external URIs and links to websites, some hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=pokemon+black+and+white+sound+effects PDF link annotation
    • https://paeonia.ch/userfiles/files/15404349036.pdfIn PDF document text
    • https://areicon.com/images/file/8695853112.pdfIn PDF document text
    • http://mayjack.com/upload/files/8673028262.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/42464220080.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465c3e264eb---7831843810.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4b8d9295b---kidunafalezidanojomaf.pdfIn PDF document text
    • http://viorina-deko.com/images/file/34050615202.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/fokasojebenimopuxekob.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614356439e9fe---42816368139.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/22641373130.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/42475550528.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/81108059853.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1lf06nveh96rv35jnftdripa16/susizufajetazifudu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210923044243_s8dlv6.pdfIn PDF document text
    • http://www.og2c.com/images/file/mulolazima.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/bibatipabiremudizodiko.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb6bd6d4c5---59233518691.pdfIn PDF document text
    • https://festacontinua.it/public/file/11077867563.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/60549127078.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/13855351428.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/60125860514.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/1491793535.pdfIn PDF document text
    • http://lejuriste.ru/files/file/6796610154.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_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 22820 bytes
SHA-256: b5ee2c7196418bc5067346ff89d7cee14e60802b4a87899bb49a6605a6675826
font_01_sfnt_off000152af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AF 11060 bytes
SHA-256: 1ff7f0a92619013295c439ef3e1e8db2fa355bf42539cb01e03a1cf20d136bb4
font_02_sfnt_off00016c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1