Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b453cf7bba6282e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 04:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b4f554c2caa603eada9c9fac2cbe07f9 SHA-1: f0c832075408f49e98841a30fd4ff74dd0feaef3 SHA-256: 7b453cf7bba6282ef2ea37ef2830b58d922b3b42bce660ec2bd500c659187282
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and link farm characteristics align with common tactics for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=what+is+black+hole+app+on+android+phone PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf5669538---4011800665.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/durejafif.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/855085534.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/13477952387.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1a934f9e54758b9d38f0b0d0c166537e/renivifavafi.pdfIn PDF document text
    • https://bor-diing.com/upload/files/saxujajivot.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/j7n0jr7aefhobcgi1jk6svbh8v/kolim.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/73521325187.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210919042630.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/pufasejobapoduki.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/pawoverifixulorurakoke.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xidevunoxurunasef.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/juvadu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a25664bcea3049edb3428b3658229c58/97400809596.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/tumekez.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/44339250011.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/litogexejavagar.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/lejeviperifetudizej.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/bafusasowil.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/diburidasoparexese.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/71532364691.pdfIn PDF document text
    • http://safetruck.gr/images/file/78993857668.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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 10836 bytes
SHA-256: 204efec6698c3cb01dfccc0a6982861e62019fbed84fc60f324361dfb5417a4e
font_01_sfnt_off0000c81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 18212 bytes
SHA-256: d053589ef7478a6d0d394bb98296ac943e39ffebce22a25561a4f626ab6199e3