Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5d4283253d665d…

MALICIOUS

PDF

71.5 KB Created: 2021-10-06 17:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 00950efda534604a5f66f9ac9349db01 SHA-1: 5bc89a86a49038c8a4f0adf24cedbdf01981c2f5 SHA-256: 7a5d4283253d665dc5e5e1bcfea4a5cee1485112949959d9d1dad9995187955a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis suggest the primary function is to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://kpdb.org/userfiles/files/34175450906.pdf In PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/94150597832.pdfIn PDF document text
    • https://ms01bet.com/contents/files/5354717848.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153d38765653---bajudilodamadolefunoz.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/1101674408.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca63cb53bd---rudazemikupesosuvij.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/sekuwisasukubisugumivifup.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/89044381349.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/34234030459.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/rafobubuji.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wopojorewatitenixanes.pdfIn PDF document text
    • https://data-face.noithattoantam.vn/userfiles/file/70487991610.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/85201353132.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/lebixe.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/vodow.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/feluz.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/77550690773.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jcsl2d4gfl0t01bjqobe5psvu4/govifasusuk.pdfIn PDF document text
    • https://businesslife.com/content/file/gegufisojovoluzinut.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/materigozuluwugobimomavon.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/rusixekubusesolu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/sefilonutolikiguxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2015+ultra+limitedPDF 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_off0000b3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C0 18100 bytes
SHA-256: 56d369ba0d4ad40e9523463bd624a9cc35de58c96da22d497d4ff50cddbbf43c
font_01_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 10448 bytes
SHA-256: fe29d65e638f404be0ee4655c5ec74779e6eb95365b48751d8a6130e1a5088a1
font_02_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1