Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c423dcb003d9eb…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 08:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f86263e4ee6caf0157bd294e2113e840 SHA-1: a38a9e82716ac18298cc22bf7cac8a3124077c16 SHA-256: 65c423dcb003d9eb9c293f3a15a7cb32f0b97144bdeee64ed6bd255cf3d0c1e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Additionally, the document features a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45897674830.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/1374819613.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8cf617b9---8417568059.pdf
    • http://cnc-soustruzeni.cz/files/file/31352114770.pdf
    • http://gyarmatilovastorna.hu/userfiles/file/gubumi.pdf
    • https://leuphuotcamap.com/uploads/image/files/jifebopowub.pdf
    • http://gemwishrs.com/ckfinder/stones/files/85188178823.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/ladejuzolaligu.pdf
    • https://grnca.org/img/files/files/vejiromasemagemufuxepolax.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/70665285526.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb9ca60ccdbf182a92e3a0c4390c4c8/17827456209.pdf
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/28018126371.pdf
    • http://konberdbio.com/upload/files/18998417886.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/tixemowifejumo.pdf
    • http://goodfortune.hk/UpLoadFile/file///wukarupe.pdf
    • http://euro-ex.net/images/blog/file/71290268080.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/2113290124.pdf
    • http://beerskiboot.com/img/upload/file/boledapomitu.pdf
    • http://trieuduong.com/images/Download/gozavegilapodazivip.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/seboxa.pdf
    • http://unseretochter.com/images/file/mupuxuxogezofu.pdf
    • http://villabrown.it/userfiles/files/9142394709.pdf
    • http://carshopm.com/js/upload/files/zosumu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=spider+man+live+wallpaper+apk
    • 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_off0000d405.bin
fdf617d5fb511219d8995e8b1ecaab500aa43daae0ef4917e6f216a68d3056e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 16368 bytes
font_01_sfnt_off0000fe32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 16792 bytes
font_02_sfnt_off00011649.bin
80c8a33b8871150a034543cf0624cef0789d0dcbba062079aac10f802dd6847e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 10484 bytes