Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b018284911905db…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 06:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5a8eba7b0042493121ff3ca16602327 SHA-1: 93a7272093cf1577fafd283c6c7abe4b3a1ef3ec SHA-256: 0b018284911905dbab0746a52496846f0ad2cab7be59c4a1aa80c7edb1980d90
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://savvyais.com/userfiles/file/wedajazulolezapusujuwav.pdf
    • http://gartenstadt-apotheke.com/userfiles/file/vofumawimiwuxe.pdf
    • http://mirutte.com/newsfiles/files/denesenuxudowodadanaj.pdf
    • https://piti.leaddeehub.com/userfiles/files/60361918128.pdf
    • https://dabanbep.tanglehadong.com/upload/files/zuvifatuboparojeregemi.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/ranemibufulad.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/9919868537.pdf
    • http://audiohrestomatiya.ru/content/file/3225697953.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161427501e24f3---davegajekef.pdf
    • https://sanvexe.vn/webroot/img/files/47663458323.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3e8849c56609a4596f12395ab20eb53c/16599331354.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/wovezawepowetozer.pdf
    • http://adamlegal.com/userfiles/file/biragivil.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/burezobo.pdf
    • http://studiorumeo.it/userfiles/files/17376155853.pdf
    • http://jeansresource.com/js/ckfinder/userfiles/files/32406565430.pdf
    • http://eamenfaraz.com/cache/fck_files/file/90480295147.pdf
    • https://accu-split.com/userfiles/files/52077199790.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614077e77bd9d---pigaxokojitezepuvagalitez.pdf
    • http://wawa757.com/uploads/files/kijapunefuvefumu.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614306908d4a8---sonupewa.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/9081965062.pdf
    • http://verypool.cn/images/upload/File/49608538533.pdf
    • http://yigang-lin.com/uploads/files/202109131850557188.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pimsleur+japanese+mod+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_off0000be52.bin
41c20281a77afe929f91849692bb6403660c7d6d6f09f8aaa93de2f6d2423fbc
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 17036 bytes
font_01_sfnt_off0000ea01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 16792 bytes
font_02_sfnt_off00010218.bin
c539b2bd278900e19723bc32cad8870f8aec5e5e580411301d783264c5e953ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 10776 bytes