Malicious PDF — malware analysis report

Static analysis result for SHA-256 254b2729d3c916d8…

MALICIOUS

PDF

110.3 KB Created: 2021-08-01 15:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 076fd3a86c6618a4fa015b643ab8a067 SHA-1: 61cc2b1af9d27212209b8874aeb8f892ea0b3f72 SHA-256: 254b2729d3c916d875bf6ec95356f9357da28e78389a81ad602d4f8d1156494a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/e7640aa2938675a5149d7d2a651cb756/97518614519.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f1926fb13ae1be6dccfa34924eb892a/68303632660.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/30647786367.pdf
    • https://shih-tzu.ro/files/file/36451562691.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7780a3573---piniga.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/8s5fqhb33eckomuat7gkdg7v2d/34241570631.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5441cd312aee9c604511c933a0ec6e61/50048439180.pdf
    • http://ingpiazza.eu/userfiles/files/23829841391.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cc4c29030680cec4e43e0b4b254ef15e/12626611656.pdf
    • http://ttlh.vn/storage/ckfinder/files/80520294442.pdf
    • http://annandale1963.com/clients/69704/File/zimababege.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ab2563c469b6cbcf017a65fd63c9059b/ganijokomalodivepawoti.pdf
    • http://beiks.info/public/file/6185546863.pdf
    • http://grubstreet.ca/ckfinder/userfiles/files/84134514517.pdf
    • http://sevinctekstil.com/resimler/files/nakojexe.pdf
    • http://visusmarble.com/images_upload/files/pipuvadaluzuxugazefoj.pdf
    • http://www.bsa.by/ckfinder/userfiles/files/nukelesu.pdf
    • https://rocksoliddesigns.biz/userfiles/file/wawijamajikelewiwexatidat.pdf
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/jifobebiguxaf.pdf
    • http://sakem.org/userfiles/files/fakome.pdf
    • http://domholidays.com/userfiles/file/84847485686.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210525224746.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/bcdf716c4e4e8dda63c5fd06b25f05c2/gafexivavovidetegajakes.pdf
    • http://coclub-us.com/ckupload/files/fadenubotipubokumi.pdf
    • https://daaeportrett.no/upload/file/rarowusigewewupolunodaki.pdf
    • http://faisaltowel.com/survey/userfiles/files/rexutalutirefefiti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+to+give+sam+stardew+valley
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013457.bin
39a62183af207f334c5459d36de7ab322f472d50f4e111bd0d8527956d765a53
pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 17780 bytes
font_01_sfnt_off00016305.bin
aeb4a4318012973471c0b327c5490dd15e01a25442fbd449dba18c0b8a8b0d33
pdf-font-stream PDF embedded font (sfnt) at offset 0x16305 10852 bytes
font_02_sfnt_off00017bfe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17BFE 16792 bytes
font_03_sfnt_off0001940f.bin
cd995502891255dfbcf4afd28e083ab8bfc87dc57603266f4586087dd25ac3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1940F 16100 bytes