Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc3ff01632afc22…

MALICIOUS

PDF

87.9 KB Created: 2021-08-10 04:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 724d9df7b827a933f3db8cb543bf7b1a SHA-1: 1a0a47d20cd22188f9055ec9813ffc6a00a61987 SHA-256: 9bc3ff01632afc2232aef77fb1f584ffeab0c07f8bf85a2b01f9907aade79f57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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://partner-support.net/user_data/userfiles/files/zibadusefaru.pdf In PDF document text
    • http://2ds-creations.fr/userfiles/file/rerobegotadokabipojob.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608986b656285---88604176548.pdfIn PDF document text
    • https://arerp.kr/data/file///safobozolo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf0ca401a5---jixilefubonu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088834f5a75e---xuxafeduvawijezaxafit.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/27004449408.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/97082984981.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/nenitijinixutigag.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//36839584180.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210809_2C6F8CF23184BFD9.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210730013250232.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/18a2f6308280fe07268f0c0fbb6dcf77/56975885592.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/notojexut.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/revubezimanesomawovag.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/48371073042.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/i18eusj2bhioh2udgcb9mo0ep1/vugifufivefatebivevogef.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/valile.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/55757419849.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/f6134ff69bcc49a2b76709764d94132d/somanozatotefapejem.pdfIn PDF document text
    • https://www.crpm.ch/ck/ckfinder/userfiles/files/10297691669.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6a97a27ba2e553a3ba54b9ae09c9f5fa/wadijopeguxezononulin.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/faremamobifefofa.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/21969204372.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/lapul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ejercicios+present+perfect+en+ingles+pdfPDF link annotation
    • 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
stream_005_off0000f1d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF1D5 10744 bytes
SHA-256: b494c73cad2b52418c010e977315509e44c9d82f7222a37a2d08ac602673e1f6
font_01_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 21028 bytes
SHA-256: 9270308b2194f1bd65d6e5fadee48c050a09fa0d1452af01330991c9221952f7
font_02_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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