Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaa9a72d7efe8ba…

MALICIOUS

PDF

71.2 KB Created: 2021-09-30 17:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 749b66dd0f91ce74dd0d3f3265eaf011 SHA-1: 98da0bf4d639309193005a616e42b9cb45e60d80 SHA-256: ffaa9a72d7efe8ba3cf8bc10a2363315041be64944e470931a79eadc20578e42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=svn+client+android PDF link annotation
    • http://ozdoby-betonowe21.pl/Upload/file/vaderuvurukaxureluwul.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d79a762d---77900523501.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210923001400.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/domuroxumoveganuvifolevus.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352d483b734---75474095901.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/21391315210.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/budemuvir.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/wutijore.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/21689453375.pdfIn PDF document text
    • http://didopack.com/files/tefolizomubewum.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613109af54644---45456810188.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/bikofolevozugexizo.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210922_211258.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2cf2653a222d972b81a6b65de81b2029/48203334848.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/58040280134.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/mozizajojimed.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/kolugetut.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/josewe.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/97635561776.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/50726495765.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/zaredemisofuvalopepi.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/61488921134.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/laluk.pdfIn PDF document text
    • http://sunway.me/uploads/file/24200410849.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/28339310082.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d3355acf---temovupisovudoraguza.pdfIn PDF document text
    • http://lagrupacio.cat/file/jupavopijaxulatog.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/furorasi.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_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 10336 bytes
SHA-256: e670b133f5c0e27af1977e5ddd2499cc21c70583efe1c2a9254b669f128ebaf3
font_01_sfnt_off0000cb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5E 16384 bytes
SHA-256: 280bf274c27b935a6ba05418983fa430514bc177bbe790df80649d59bce1b24c
font_02_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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