Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525c1db1fb0eb52…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 22:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 459c2b06045fa8e424fd4bcd11fc0648 SHA-1: 9171381a8ee3ad8ba119fc5142f94452aecc3be7 SHA-256: a525c1db1fb0eb5211bc34bddaa4ee3054638adb90f63ee28eb873d83795e76d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO manipulation. The presence of multiple external URIs and a link farm pattern points towards the T1204.002 (Malicious Link) technique, and the document itself is likely delivered via T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=list+of+automobile+companies+in+gurgaon+pdf PDF link annotation
    • https://aodaixuan.vn/app/webroot/upload/image/files/51381471445.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb87524ac42---talotejononefeveje.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/34126090244.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3954577ce538726cf3348e2e3fce9c2d/beredajupexisaloxe.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/17619538521.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021717628405206.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/keborulofavuvir.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c9ce6382a2bf700f269243217c8b8496/fuxateweteduji.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gidebovuvodamuzugopamuse.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082232912258---sokejajodi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/kamivosukilixu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16114306fcacb6---62009220394.pdfIn PDF document text
    • https://neplatnasmlouva.cz/soubory/juraselorevar.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/82952629284.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe612ce1a2---52387380497.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xenufirababez.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210626000509_o9uzta.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607730b1ccaf1---satesekevitot.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/6381832527.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/pefutera.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16090674806a0d---80846023649.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e630f77c341---22491677770.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/26673618683.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ceb3c33a49cdeb50f7afbbc83d2d6a2e/posewoverefolon.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 11160 bytes
SHA-256: 3ef47bf2b2d2241902ae4d819e36873f49843d03f3d8c9fc7758400e82c1b984
font_02_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 18000 bytes
SHA-256: 144cb7ed51e9049cc4990a29703e2729507e05361139894c34510a1a26704b70

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