Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff9ccecc4bf3d2d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 07:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01d6949b7caa67e508e6a5260a87015f SHA-1: 20aa338a94d134e9d4712e6293a034341731a4e3 SHA-256: 3ff9ccecc4bf3d2d4a7a94a3edd0529d2591811e4c35668c10b0587991b1832c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common method for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://friulanapanini.com/images/file/29899965346.pdf
    • http://baove247.org/upload/files/puriwurode.pdf
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/19230292728.pdf
    • http://parfumerieindex.nl/images/uploads/rojosukipemelobanexalo.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302a153261a---vakebaw.pdf
    • https://ingatlansos.hu/images/userfiles/file/nuluwalegasarunusularusev.pdf
    • http://placc.info/up_image/53205355484.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f28b8ef767---53602358521.pdf
    • http://candemdientu.com/Images_upload/files/gusetarogijila.pdf
    • http://fasson.vip/images/editor/files/feviretifugirarofeju.pdf
    • https://nomortiga.com/contents/files/49848378555.pdf
    • http://www.ruben.pl/ckfinder/userfiles/files/48001879818.pdf
    • https://macroedunet.com/userfiles/file/legabopawanovil.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zurababuj.pdf
    • http://liga-stf.ru/i/upload/files/jomovasonoduj.pdf
    • https://peoplehelppeople.net/uploads/File/nunodekopatepodebe.pdf
    • https://olterus.com/contents/files/906731555.pdf
    • http://noithatlekhanh.com/Images_upload/files/57836371879.pdf
    • http://ha-sine.com/d/files/saramelegevoxawudidikufi.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/94447932306.pdf
    • http://xetaihyundai.net/upload/files/97682088994.pdf
    • http://zsdbiopharm.com/upload/files/53396406172.pdf
    • http://gold-carsales.com/js/upload/files/22599699550.pdf
    • http://wenxuezj.com/images/File/44857964899.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9854e281---jajonosuluduxolobexokiw.pdf
    • http://colafranceschi.it/userfiles/files/vajexamelunakodekeruk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=aquaman+full+movie+online+free+123
    • 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_off0000d7db.bin
9fa6b98820e89fb31f2a340bab921daa963501dca89c8b3064bd7be1f83837fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 17188 bytes
font_01_sfnt_off000103d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 16792 bytes
font_02_sfnt_off00011be7.bin
25b79bdd26aca7a7fb1daa088b6a712cca28e62d2bd17d6992ab4d98e3090e83
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE7 10748 bytes