Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed5e7a9b0c438cc…

MALICIOUS

PDF

78.4 KB Created: 2021-09-19 12:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30115d0b434071fd95eaf1120fbbf8fe SHA-1: 714bb6569157227102be9f214749cb6cdcc48445 SHA-256: 1ed5e7a9b0c438cc3a17bbccb20bf4b8cae73d752d51f754356b85564e332708
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 https://fototipia.hu/files/files/kokifarodopuvabakubenepu.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/tuwazo.pdf
    • http://pedraferro.com/files/files/ziratokagemam.pdf
    • https://ptogel2.com/contents/files/tapilo.pdf
    • http://www.blueoak.fr/image/file/79133916319.pdf
    • http://okuninka-biale.pl/userfiles/file/tokakeponosinakeparizegum.pdf
    • http://solee.cn/ckfinder/userfiles/files/fepumawepuzupimumifew.pdf
    • http://kidsjeodo.com/images/files/lifonogiwumugebusazumepeg.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/9503770055.pdf
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/19876755366.pdf
    • https://actaviaserica.org/board/file/files/82708809279.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k9fabk1823m84m4s7rg47ios27/35365363596.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93825171110.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qhrl43s41btsfe725enll9roqf/tisuxofilofu.pdf
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/99197621156.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614410582ad1f---27871271359.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/48033145474.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe6267998---6575289707.pdf
    • http://www.eau-msu.ru/ckfinder/userfiles/files/sojozefukem.pdf
    • http://amblesidewindermere.ca/fckuploads/images/file/ladufotubinumelixirafuzof.pdf
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/dodesapesedujokofun.pdf
    • http://khyljg.com/uploadfiles/files/70672385455.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/d3319b9f03bed82e322c7f74df110f5f/dipuragidujitajarafom.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/kagilavejejazewixadapus.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=applied+statistics+and+probability+for+engineers+3rd+edition+solution+manual+pdf
    • 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_off0000ca9d.bin
6dd29980d6c1fcb6e4f7be9fc19e0c8ce31ab8c9d158c9836f1380a4591e8593
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9D 17736 bytes
font_01_sfnt_off0000f89a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
font_02_sfnt_off000110b1.bin
09a7cb846594cf9d8718bdf8e07df196b226f7835ccd2909fdc9b3341eacd24b
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 11472 bytes