Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8dec207f7be3a7…

MALICIOUS

PDF

85.8 KB Created: 2021-08-07 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0147ed96e7c1f1dadcb283333b54e9c SHA-1: d924811d1660c5de39d245c820ebbf71240c6d66 SHA-256: 7e8dec207f7be3a702a0b46c4d841223cca5f7b265a5bf0c4239bd1e4cafb818
176 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate a malformed exploit stream and that the PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://vin-baietii.ro/ckfinder/userfiles/files/48053121455.pdf In PDF document text
    • http://nensi.si/upload/file/57918341741.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb7f3f048---seligisazovinujazopafe.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/xebexigududumuta.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/9478278515.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/nusopajubazuzoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7dae4c41d---85370812591.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d121e4b732d942e416a70d0c6d2dcb1e/tujowif.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fabegufonobori.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/03a3005716c4086c61fc2c9f3d6720ac/72620066678.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/66268508266.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/pakogovaliboda.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/redimomogegofubudijotedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831fa729e5---27734471413.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/gedejovukixiv.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96507629db0c8fc22ca84cdced2024cf/bixadiwerox.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/fizavevizokufuxat.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-3/20210703035241209208.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/sikilolas.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wokema.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/tejigawekulopix.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/javaxugewojo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9029e8272c---56108816679.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a9015120---2433934937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+are+the+9+cases+in+acls+provider+manualPDF 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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 11108 bytes
SHA-256: ddc8c7cd5a3724c908c7e57658ffdcc5e4d0eb729655596c7cf7d77e30c7c23c
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 17444 bytes
SHA-256: 8c3200630e9b1bddda6a6a309add4a2d6a335fd001f565a4b4b4f3386027c00a

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