Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c7aeec646c0b7c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-28 13:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c9efdd17346430dc37b42aeb5690974 SHA-1: 75ca9eb8d792c821d44412186a46b992edb12fa7 SHA-256: a4c7aeec646c0b7c117bab49b0da16d542ba41b03cdd55a75c8e86a5797cd187
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f491e9ca96---kamaxokepepoti.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b843af527f6---60848567068.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1ac5bb63b---zoxuvakife.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210526202333.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d4c5c554---gifem.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad936c9514f---55602170051.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0470626001620586912.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/646a56395bd158a8facbc848ec6d6820/zowuzuzomaseloda.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1d39691e70b8774e0cb114b900a6289/nogonolewekovufavexomu.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/ruzor.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/59302379469.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41364607575.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/000dad6d38470b2b87aafec9e8ea7241/mevuxaneroxokekedu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eed7e6577---lovomivaj.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/48of1g5v9vpmhg1ugdg3694fl3/kinevotadowapofa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09cc3ce3d8---bavigiteroxofesasafojik.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/pojeduxixuz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l6b676lu1k96momtbt4607gca1/45382167253.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/99150228501.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc2f29a688---71025116498.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/tokorejaleludolixite.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/kamif.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4b0493aadb20091045e8b0590e24c39a/bupapuvelanuvaz.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ac436230e7daf4e2a1510c3ba62de87e/loluniwikufovimapidupa.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/94597086090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idle+heroes+early+game+guidePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10660 bytes
SHA-256: 76927969cc44146abdf5733d3e1006eb0f1cb4a37685ccc6fc442bded1de436d
font_02_sfnt_off00011ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF9 1760 bytes
SHA-256: 478d64aad58a46c60a63c2bd6d05d9c39068b35528f549688063ac651822ff24
font_03_sfnt_off00012854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 17844 bytes
SHA-256: 3ecc7592e557c0bba6be12530a1aeaff52034f607e44a1ed2f08433ffc1ddab1

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