Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ce5077508aa280e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-05 01:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8de7d5cb6c45800105e6a5d28d07771f SHA-1: 0be0ef0f3583b198f279f663673bab7455eea60c SHA-256: 8ce5077508aa280eef4c1224e9973764bea1b05b43b648d853c1e6423a5cd059
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple distinct hosts and disposable hosting indicates an effort to evade detection and maintain a broad attack surface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/losixikamujoxile.pdf In PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf20d909c---44089081160.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/vedesazuvaxuredisiru.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868fdac7968---rokenutoxuzewudesebujivi.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/debubisemirukigonakopewir.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/01f457cd775d689896ae8ce0a105e8ae/9389923909.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6bb8ab1ec---goketesowigezowu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/ralixanowopawid.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/88459613023.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/jujojiregilipu.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/lunupesexive.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc8da5ee4---powawizani.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/97211823256.pdfIn PDF document text
    • http://friulanapanini.com/images/file/47189722621.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/vawepivajo.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/86775903683.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e26a726a15859853b6a105afe37839c7/43564652105.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2416efcc0---dawisedowaso.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d451401c1d1f6be1906b411b0cacbf10/xaromexuladujipu.pdfIn PDF document text
    • http://fkhd.cz/data/img/5195694920.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/78561467532.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/sazuvaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=coartacion+de+la+aorta+y+embarazo+pdfPDF 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_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 10956 bytes
SHA-256: fa1ddb0b3ca5f80aa1c45a913a65210745f394222db985572846e9454fc5c7f1
font_01_sfnt_off0000d569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD569 16056 bytes
SHA-256: aadcf7c40f8b77b39741e4234b81945b1883a53eb3492cc8255d3e3186535ba0
font_02_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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