Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a338e79a6591d9…

MALICIOUS

PDF

87.1 KB Created: 2021-08-11 10:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d49ebdeb9dc3fb602dee887303c82c0 SHA-1: b78222f2f28732b903580887276095abece079f5 SHA-256: 03a338e79a6591d9edb68444e9ee77ab4960ea604ea334f02517bb9f6d864c1a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=relative+and+absolute+dating+worksheet+pdf PDF link annotation
    • http://alexlunacoach.com/img/editor/file/85587747794.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/zokesusuvow.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/22790776057.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/pc6jo52f4vsofngfv7fp0q3l32/gufisokobu.pdfIn PDF document text
    • https://luminex.pl/upload/file/vejotorixasado.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/44da08ec2153b9a6894fd77987ccea66/34501677054.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3bsvhj1t4j19dogm3da18b7kk6/famev.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ffcc5ffb66d360906c6d4a1528f9ebe3/fepaki.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35e884df65---fovejetanupenudevaxoz.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4ljogdae972i2onur85km2dbeb/49676421573.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd221fb8b7b---47448998216.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/dupixej.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/goponomojefiperodabe.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/nepunalonowilaxiwuwireka.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202163224527857.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/rijabakukogew.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/48150596678.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/46968227507.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/84009697984.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847866bf79b---49419878606.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def1946a08f---sasuw.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784d0b218eb---66819546661.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a3778d5a---lutuvim.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa6a760cc85---komusifosebun.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6b51befc---11031887820.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/ff46e60b0c5d07d2e9e7cd87596483ac/dajaludok.pdfIn PDF document text
    • https://room12shio4.com/contents//files/26930947247.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 11308 bytes
SHA-256: 7681f0d63b114d59c32102fc5b3925886e5757c266e74c1d5fcbba76422c3dbd
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 16860 bytes
SHA-256: 7c6524010d1f3c798d1ea9593a8cf336d168340e0437f230e5fb78a0933bc933
font_02_sfnt_off00013631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1