Malicious PDF — malware analysis report

Static analysis result for SHA-256 810792bf2a2aa2cf…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 22:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c49e7264edcae92187f036c96fb4545 SHA-1: 2f62db129542ce565ad6ea5e5c5bd5939e94e78e SHA-256: 810792bf2a2aa2cf50e7f1bd52b9f9f32a70ddd78fc4541f524122714e14f57e
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised or disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 9

  • 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.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://grandviewgroupresort.com/upload/files/87792513243.pdf
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89024450018.pdf
    • http://industrialdevices.in/uploads/zunixerudubegiziwaw.pdf
    • https://drlanda.hu/user/file/12737023620.pdf
    • https://signika.pl/Upload/file/lenexubalulufod.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/85014884586.pdf
    • http://motovelo-nmsk.ru/userfiles/file/22005608856.pdf
    • https://marupyara.com/fotos/userfiles/file/32762554064.pdf
    • https://hongmao.tw/uploads/files/202109020359463054.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/83341657e9811f9a80cb31ebf6ac0e55/sozomejakutikewefag.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613494e8490a1---pinore.pdf
    • http://medtravel.lv/images/hand_uploaded/files/tigavodivenutuxetufop.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/potobajirawonizowof.pdf
    • http://tradeweb.es/userfiles/file/jazemefoke.pdf
    • http://industrialsupplies.pk/userfiles/files/16719803139.pdf
    • http://miwon.com.vn/app/webroot/uploads/files/12343179954.pdf
    • http://gyermekhaz.hu/Content/site_images/files/48168087913.pdf
    • https://whitesal.com/data/images/file/7023_20210902150528.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/dcc9ea2f2f7bdd4ca931f1858dc2ef68/97189515059.pdf
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/79394463682.pdf
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/dudojo.pdf
    • http://change4best.ru/upload/file/kitenixum.pdf
    • http://swiss-ex.com/images/blog/file/96733605123.pdf
    • http://vo23.ru/upload/file/10830758495.pdf
    • http://portaldo.eu/contenuti/upload/file/rajamoxam.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/60010637289.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+transfer+files+from+phone+storage+to+memory+card
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 16792 bytes
font_01_sfnt_off0001003b.bin
712dec4e012b6db9229d21fad01a369224cf198eeabd98dc78e26c6e75d8e0ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 11256 bytes
font_02_sfnt_off00011a47.bin
21cb41c9a6b68b2b0b6341447337a849cd89f30811b60910b58255715e56a53f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A47 18664 bytes