Malicious PDF — malware analysis report

Static analysis result for SHA-256 f771aab98567db9c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 10:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0313b3459817345317c87262d8b27c5 SHA-1: 34ed5481e7427d446395fd21c964865903702088 SHA-256: f771aab98567db9c139a867671f309faeac0f231278762dbc600ca57179a0064
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware sites. The presence of external URIs and link farm heuristics strongly supports a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=windows+10+simulator+for+android PDF link annotation
    • http://abc-tel.ru/data/File/20885165101.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/sakamujerolaxebax.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/bebagavobe.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/4053095196.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/dutiz.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0ade9e6---tojorevamadisodujigiw.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409af80c574---66255246105.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/37637251824.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/roluf.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/99375096052.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/vuzojoxi.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614208cb086f9---63463374114.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/38943708300.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5d195f3d5---rakifawiwefuzame.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/tutaguxapogedaviwonegaji.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e28877f234cf64d0c8e67071a32116b0/83867868172.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/90224303179.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9fb99d2a88c2d1f25fef3b06944da2dc/ferigo.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/ribuvepova.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/99273643699.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/68511093048.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa3fvbtlgpirnu5nu9me44d2jg/gedivaz.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_off0000d995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16680 bytes
SHA-256: b3c81d5b2ef182b4894cfe4ce9fb7439108460be171bbda4f5fe414aa54bda9c
font_02_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 10736 bytes
SHA-256: 9c3d6b7622c14d96f165235d2c20e06b6418f2d336e0a556b15f4c7de9f14095

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