Malicious PDF — malware analysis report

Static analysis result for SHA-256 5846ab807fa13a3a…

MALICIOUS

PDF

70.4 KB Created: 2021-10-02 19:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f54e1dfb9579b85466b27b055865064c SHA-1: dbab0cb52e840a0b4901088140fa1b73c71cd9fa SHA-256: 5846ab807fa13a3a6503ca0219bd5d01e0833c4b973729b71efd32920d987656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://censcakmu.org/board/file/files/kodutijanufuxevob.pdf
    • https://danfort.lv/userfiles/file/lijoduwavabaxuxuzezo.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/56966491631.pdf
    • http://mikllc.mn/uploads/files/sozemajanujaragagufodofi.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/nosezus.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4417be1e51ed02a72c4b0fa085ce835b/76421643723.pdf
    • https://laps.pl/userfiles/file/73545114664.pdf
    • https://nasikampung.info/contents/files/65283657772.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429d39a8d9c---nigusixosotaroxipalonug.pdf
    • http://sangtaoad.com/uploads/userfiles/file/gibibavamosalolen.pdf
    • http://moristas.com/userfiles/files/26850221484.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecd23d50b9---wipesodedanidogas.pdf
    • http://fitviewer.biz/files/file/zalug.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae1236a5e2db90dbf5420fa3bac30d66/84638751040.pdf
    • https://damsindia.org/admin/uploads/file/10746631125.pdf
    • http://tangiahoang.com/skinkorea/Images_upload/files/tiperuwogudogu.pdf
    • https://tranhtreo.com/images/ckeditor/files/wogadibagewipiralijexezo.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/45650036102.pdf
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/lebabogune.pdf
    • https://goooinggroup.com/userfiles/files/20210903_050200.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf1a1c895---3324082347.pdf
    • https://repare-ton-smartphone.com/userfiles/file/94852700851.pdf
    • http://atrsara.ir/resource/files/44248893737.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/22277946469.pdf
    • http://duetsepolno.pl/userfiles/file/96333987879.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nevermine+2+advent+of+ascension
    • 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_off0000b334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 16792 bytes
font_01_sfnt_off0000cb4b.bin
3f096fae828a57e7415699567f75cf79e3e1653e63c2719166d6f8a04fc15d04
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4B 10752 bytes
font_02_sfnt_off0000e41a.bin
4c8c2354688ef697cc94027783e815aab24a86507885b0538a15ecdbd822201d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 15108 bytes