Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e78462b8d61fa6c…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 19:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c3d7e3fd3a96c4ff3f0e59d43b437ee SHA-1: 743bb8fbec89d564974811b498a31d4245c167e2 SHA-256: 4e78462b8d61fa6cc4c90b0b2280ec455a5a588a601d1070219a1a0af9a0f09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external URIs and link farm patterns pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns strongly indicate a malicious intent to lure users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=can+you+eat+rice+cakes+on+keto PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087af4bca38d---29346944273.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a99e9aa73---92026600755.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea053c1e9a---46395055664.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608870de9b73a---fubetuwimolir.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/619f9e45e79c8b5f949fd6a7f6985cc1/96671943792.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089ace48155e---72431929088.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9c3ad4269de4a87c4ddfdbcfade72a23/zubiwazejolinebi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16074dc11799ec---26588538115.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/47263582311.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/94334381120.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/78246619580.pdfIn PDF document text
    • http://yilip.net/userData/board/file/jonojiwutonewekasupax.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/49559879805.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/mobijij.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pewalepusatikowi.pdfIn PDF document text
    • http://sns.hu/_user/file/52942221340.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6e21d500ddfb8460d31cd96f2f74550e/7643135377.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/41179485355.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed123ee73---jujet.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/josomabomosab.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/th0ur16s724d699ur466iuh780/molofuduwukujibuwebubi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9e4eeb65027869fb93620d9c0080d6c5/61586173825.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/nujumekugowawoz.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf0a3aae4---felodokerawozujovigag.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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 17248 bytes
SHA-256: 21fb512062990f750632deb104e4a0c48bf4bd2dcd3db377ac26a5ba90c2c688
font_02_sfnt_off000136f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F1 10512 bytes
SHA-256: e11c2bf71512e60b3e7b58045cb25ed058d7237a6ec3cccfb32f64ec75632f00