Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0376dcf0bfda593…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c22d591b8688223cc8da63adae5d55c SHA-1: 95a507c9689d8b71664e38873c9886a39ce9c7d7 SHA-256: b0376dcf0bfda5937d549fcc6b14fedf9cd32459ac021f9f90b98c65e9786e29
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=xcalius+x4+qr+code PDF link annotation
    • https://xnkvinatimex.com/uploads/files/zilibawewuwuzosutakeloso.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fubetes.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/perasolemef.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/tobereximejazejuzinufiru.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013e2cdabc---15869670421.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161302c921a56f---veludepabitasarove.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lasamoxutotanaxizolu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/41215385768.pdfIn PDF document text
    • http://sooclose.eu/upload/File/wapuxilof.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/sapozinire.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/6727395731.pdfIn PDF document text
    • http://www.heksan.com.pl/file/54117119014.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80019728693.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/1193418912.pdfIn PDF document text
    • https://ibericadearmerias.com/file/rikusoxutaxigu.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/pimokurepifadi.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/kafasurate.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-6/20210906090907428320.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/379f4901c3a0716501f23bf9e02e23a7/51835546696.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/57502150429.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-6/20210906230924120397.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109040307312031.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/tetulazitijuka.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kejarajirokedizor.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/86294173106.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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 17744 bytes
SHA-256: 22d6a7351f5b55a9d649a99dca2f5f2b75c2c85a9104c9e88864158fbb29a91d
font_01_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F6 10596 bytes
SHA-256: dfc649fdfd31c969975432510489cb71c76605c2cd151ea25ce0f32e25b0b26d

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