Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da20c1aee17df6…

MALICIOUS

PDF

86.6 KB Created: 2021-08-03 16:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0010d071f10b0be16ad76db00b383d9f SHA-1: 661715d3deae8f69372aeddfe8f443e3657607b4 SHA-256: 41da20c1aee17df6b24289a4fd4e0e8639bb5725acd3f43cfe2bd0210304c652
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to lure users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://coretry.ru/uplcv?utm_term=activity+periodic+trends+webquest+answer+key PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ca655592b7d4a1d0c4edb40a489879c4/56321339452.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/529df99e78c4f3544068e06904a9f266/tivarotux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/hm24svg59bta239dmpi95gsbes/vumojisiwumewemes.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/bae3f2dd1470d6be5f65f0e4eb2e8dc9/7041516648.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vevozubosozibedufuzibutab.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43a41edd2---lazujapusezivom.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/ruzunun.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/diweji.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b245a9d8967---kemerawovagepomejekunalo.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/wujoxadogipelitejas.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9338f66c06---tefabamadajekefexojav.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160714a321c0ec---rikanukadi.pdfIn PDF document text
    • https://arerp.kr/data/file///10799896019.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/fupedenuporapelumif.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45ce79b4e9c468d7ebb568e680492948/kadatumepexozonobilof.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/59491f4f871d42446df4d92c14aaf2cc/gomadumoparubudinutakolig.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h4k3ut64e56lvch8r9kl512u7o/megeduxi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7d589f237---32593520129.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/6118975914.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0e3c990cd531dde828348163af578222/guluguvupi.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/xadugojunabaxiwi.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/93502439374.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/dazonoparosu.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xomefufifowebawulefide.pdfIn PDF document text
    • 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_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001064b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064B 11184 bytes
SHA-256: 939fcc9cf65622bb5ce57c8c4d2be467459642a63bcd00332d4408cd3555d10e
font_02_sfnt_off00012045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12045 16680 bytes
SHA-256: 40859a06b3a2e92009cfc2f6786d06438d73d4ac0daaa5c669a334825e8cceb7

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