Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d80dd2af9727b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 10:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53da4a821ffc1be64a9032050ec69f44 SHA-1: 33a70f8906d668e6fdf82a80b9bbbe8696fc297e SHA-256: 4e6d80dd2af9727bc7d4857440b2d1c0e304d59f1d6bd717cd9cf03ec8d7be21
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware. The document body is unreadable, but the heuristic findings strongly indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=phone+number+203+area+code PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8686a07072f676d6798d6fdd8b8fe261/61613380761.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/mjp6rdnh593q0bmgt7i09ficb8/33766197925.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/79112607862.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/950f157266a30552843a98b7dbe6d8f4/besoxuwikof.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/xutetibi.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210810184455.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e441c44ed46---79002446478.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b566d1a40c3---35799956156.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/99c768ded066fa4ffcc85efb07e5149d/vopapowazug.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c8345e8cd---81484534347.pdfIn PDF document text
    • http://cy2hand.com/userfiles/xozopemakonikezilof.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/99039606766.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/46122523565.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e674c94c66b40b63dc6bc94fea413096/bisetafilopafisixafibaxut.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/zakirodi.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/getovad.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/wixasenawalatim.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/43694778092.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/walokux.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f1t2a9ahjlqtua9oth63ndmae4/53872048601.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775075d532b---72578443259.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/lamelagugimive.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/benod.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tojadaxifiwag.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_off0000ca5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 16880 bytes
SHA-256: f52c24e3699311e917d522f3963f27db90281ca454f998b2f60ed9993390cfe4
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10884 bytes
SHA-256: 5a1d819267dbc47f127ede475904c8f0cba1ca885593fe7745e111901aa29018

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