Malicious PDF — malware analysis report

Static analysis result for SHA-256 09235a662fe1dcb1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 01:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0a8aa894640d3adbedf76c2a7c45db8 SHA-1: 3fef47cfa77b808a0216feb6f642fb43aa3d5a12 SHA-256: 09235a662fe1dcb1e5797667b5eed5c27b8c0f5c3e753a012a5cb787f3d7f514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=tamil+new+songsmp3 PDF link annotation
    • https://foundryindia.org/userfiles/file/32716927102.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f101e5c950d0486b52f7a96992d5513a/refawubisume.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/01d23025b933a9ff1f7aaf3af19d5155/jajeroxomeromejewof.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/82386967906.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d79f36c8707---3843419939.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/jevarenixamogalexerezolat.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b40efa0832f---favudar.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c285ae9cc13---dumegonuj.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/070c583cc22fbd1ed59d9ea48ea64ab9/jujisaziruxigupit.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/99430058575.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/24375146056.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/sevonawarofelodazu.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/39983736127.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/76235720046.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/9geji7s4qkqglk3i13rmituro5/65858765653.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/n8gd8ngqrqa9vjbr0k76fkna7b/18226503599.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b7795d6513ea7d8c8a0bdd034f51c6b9/geribirasuresiv.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062609025726.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xarul.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/lilelumupafoxa.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5eb15d701---72234364175.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/g3tii09nq6pgnip8rthllfv4e2/jofesozifenetosurojik.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/lodevodezasomatikazurajo.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_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 16852 bytes
SHA-256: 1ba0d9893b22226e9fdad45413589be78d31ffd8d4f1782777e04eed991ad1ee
font_01_sfnt_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 10616 bytes
SHA-256: 75327900b68af5be779147db9a51457c9c44e2af7c28f41f6c3c91c5782e6315
font_02_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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