Malicious PDF — malware analysis report

Static analysis result for SHA-256 0881c8e5aee66c14…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 04:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ddf862f4bb1d858ed42212cd2f45366 SHA-1: daac7c40d551ad4c5a18eefa586a701da8f60fca SHA-256: 0881c8e5aee66c142ec161c835a3f61477f1eb98450152436761106e20611c28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories. This suggests the PDF is designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b22db9af---41726726403.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e3vljdf9a69dvkvt716391r5r1/87234778491.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607998706c3d4---32942340417.pdf
    • http://someteme.com/archivos/_20210822005122.pdf
    • http://whalesart.com/uploadfile/file///2021070413523175.pdf
    • http://mariopresto.pl/userfiles/file/83741381057.pdf
    • http://zaun-produzent.de/userfiles/file/80346133118.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/42249316479.pdf
    • http://montaze.org/democms/userfiles/file/vubegixudojisi.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae320dc1b3---26822937685.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608934925fadb---luzoxepiperanozolin.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/53297743320.pdf
    • https://paymentor.nl/uploads//file/22900611001.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f921581c27---disolutigegugogas.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2416b86130---61082007791.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/20136548624.pdf
    • http://poney-club-romilly-aigre28.fr/userfiles/file/91309452975.pdf
    • https://h16hr15k-h19hr37urn.com/contents/files/95964597066.pdf
    • http://ottotech.center/userfiles/file/bedapalituzubivibig.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/48953535024.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/99369693547.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/81587832446.pdf
    • http://hangquangauto.com/files/42858104483.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607722873e04a---69521269220.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=elementary+differential+equations+9th+edition+solutions+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_off0000d6eb.bin
3d10801b045b89e68356f6a75d72d30cbc776fa7f8a6a2d60b72ac22261f25e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 11272 bytes
font_01_sfnt_off0000f0f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
font_02_sfnt_off0001090b.bin
989aab855a57bcafa803ce5277fa362c641a5287ced22c83605e60ed64746e54
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 18460 bytes