Malicious PDF — malware analysis report

Static analysis result for SHA-256 177064f403500116…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 05:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a330121158a6365bcbac6e878c2e54ae SHA-1: 7c597446117eed7398f1842e977642cf8b423085 SHA-256: 177064f403500116fff1d3ba45d7a37a890ece963a3ffe5c21b6ea83cb01b354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=very+decent+meaning PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c263eed08c4616410e2709ad9f8e3af2/57788503963.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b40220e8ef79633d50327c7b39cf6bc0/gikutunafaleza.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16089fb5c96d9a---13954680126.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/kewefumatasugolitenelex.pdfIn PDF document text
    • http://finchamauto.com/pics/bojukodaw.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/74678667463.pdfIn PDF document text
    • http://come2menorca.com/images/file/79275026297.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609279f104cc8---gafemud.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/31414740798.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/mtgj9mt2hsji6fs291va2dbs6r/sowurowirujixuf.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f2e917af4a1f6904225b1104899f661b/zajez.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddcf91e57c---xanawumawadovorazif.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/84332670088.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/e23dd4c3413c1098dfedaa9effc9ee52/38504306353.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea932941f---voxifizoburivapu.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/sepewirabobexutajejap.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/70633757517.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/fidogezi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/bowulozer.pdfIn PDF document text
    • https://tsegypt.com/file/mapeti.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_off0000c7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A0 20160 bytes
SHA-256: 8d1860f0364d8f7d3957db4caec3ba4b98461bf65173d7f2e48dc07b3e4f8801
font_01_sfnt_off0000fbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF1 10464 bytes
SHA-256: f0dcdba0ecacf17ac5b2733eb1b71187ee95b5c6daede85f5308ef00f10709cb
font_02_sfnt_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1