Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd8155bc5705bd3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-19 00:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4e754ea0084f8743d1f4c5d1f34678b SHA-1: 42c10d0d1cfcc8ac5627da8c35d4efb5116aeb99 SHA-256: 7fd8155bc5705bd32fa4e5d04091b4f62cdb6d5c790e691ead0f42c8da164b57
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=one+cut+of+the+dead+online PDF link annotation
    • https://helicopterleasingservices.com/userfiles/files/86638876785.pdfIn PDF document text
    • http://ty-int.com/files/files/13654317008.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/sadek.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/69733110777.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nuneredut.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xidab.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210913172649.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/lumokemub.pdfIn PDF document text
    • https://keongracun.org/contents/files/34696807213.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/pakazijagenagizovuzotivo.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/35713433923.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/zimubutawegelugevolupid.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/desulisesip.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/vapisukedig.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/jagitarab.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/59525763164.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/13671862835.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/xibonuzomivupekaze.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/silomin.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145684189f36---63134384527.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8c45c4384d2eac1787b972f3dec57492/64736516293.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/puxedikotupufedov.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/09bvg0bd3nad3afphbqepetspc/semadobogane.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/29739960278.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_off0000b17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17B 10428 bytes
SHA-256: e0d02ff804895e3d77bc51ee2a9e6586933d42c19595de61599cf8b843ab5030
font_01_sfnt_off0000c910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16676 bytes
SHA-256: f30ed0926f118cf713bf14ee9a260362f2ffd80755126b5c55eef8f3fb54cd7d

Open this report in the interactive analyzer, or submit your own file for analysis.