Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef23b6af9f874a6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 23:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2785fac4c85d8ef4feb1784ecc8b189 SHA-1: 8903e06ce5281335e61c4c991ec59109aa67f64c SHA-256: cef23b6af9f874a65f30ae17a1eac4536431c55e5e3046312243abca221c6e63
112 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute code, likely to download and run a second-stage payload, which is a common technique for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://paintingwithapassion.com/nbloom/fckuploads/file/57246022039.pdf In PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/13892457339.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210904_104847.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/satujaxi.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/56894308936.pdfIn PDF document text
    • https://mangallagn.com/images/file/15713450308.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/wafalupomitesox.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0fdc94f6afb299b24a4418a93e38c695/linoxo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/56677239283.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/zaxufiledewipifezoger.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/rixumodizujizexat.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/gegaji.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090519533696002.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/16880701325.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce4a1bf9a---kewofuwesa.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a04d7ff7a---fisuxudovibenovinewutelik.pdfIn PDF document text
    • http://cortabellanews.com/userimages/72513388094.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/71756204429.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/72688500935.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/timisugepijexuwilewel.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/rolovokolaja.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/fepopadeba.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/11186801800.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/nanedidaboxogevaxibu.pdfIn PDF document text
    • http://partnercable.com/files/jezoginidolajozilevomow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=website+to+see+instagram+stories+anonymouslyPDF 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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 10796 bytes
SHA-256: 93b152e39747d6fb9a78b0ac7133d1e5f234174673b5bf6d4914b104eda0718c
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 17636 bytes
SHA-256: 1ed92da984195f5b0aff63c75f8960adf62ade59520e8db091448a00d9c6921f
font_02_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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