Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed70c41693bd0769…

MALICIOUS

PDF

72.2 KB Created: 2021-07-22 11:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c5bb6196a76627df373ad8d4a9da56c SHA-1: 1513bd0f265c857bcfe943a500a5eb73ca2eadaf SHA-256: ed70c41693bd07692e592dd33e952a4220c49e3184cf31b1e12ebc325e2af42d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous external websites, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted from this sample, but the presence of numerous external links and the ML/ClamAV detections strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://lapenya.cat/imgjovesnaves/file/58712700512.pdf In PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/75481489492.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/396946838.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/30521941396.pdfIn PDF document text
    • http://dakmet.pl/upload/42120982225.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/0b6c7adb9b3bed6525c03aa3c616864a/poligexitazezado.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/91534429661.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/6192beded30c947de6a98487de048191/42325682448.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/282c835510071f840d8d4cae6b24190c/safijulub.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/lizekila.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/59237579816.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/aa552a04a353e284589a51316433950a/kopukojokomijuzu.pdfIn PDF document text
    • http://stl-hk.net/userfiles/93919082455.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca882169f6---judadena.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/61cc93e2f07719a974552980d07e8aeb/80097698267.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/cc53db64ef04b39acb62187f26099786/bolanevexamagax.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/75243961228.pdfIn PDF document text
    • http://stylekd.ru/files/minaxirojelujavivep.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/51904614179.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/37431e4c2734a62938c2c226aed73282/pisixukibexowod.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/zovazimirugokobewepome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=camp+ocean+forest+emerald+isle+ncPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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
font_00_sfnt_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 15920 bytes
SHA-256: 2a2138cc5e9ac311b19f73871f2b13e1f67b7080628499ea5e235a703c075431
font_01_sfnt_off0000e0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D5 10812 bytes
SHA-256: 0a657991f8522827db3090039bb79ef4220129bcf168a1d206e85c6f0af71562
font_02_sfnt_off0000f9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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