Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17c08b70957bcd7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 05:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a055fbb98ad5950d7e31bf1b992ca49 SHA-1: 1051fef94ba183b2d7c6d6bab7a361c830d0fee0 SHA-256: b17c08b70957bcd793fd3476020fa13ea97159efd9459fc49591f4ba6c1206ce
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users. The presence of these links and the compromised hosting infrastructure are key indicators of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd92f3fe---13765821163.pdf In PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/91600141852.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/ralenojivuf.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/71547576260.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/38448106845db3dca6a5e268fb7523e5/wogujeratizidat.pdfIn PDF document text
    • http://xn--80an2aej.xn--p1ai/up/file/36934281584.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/48784360133.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1629891057.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efc325e739---tadosefuzugolu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/55989353376.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/tujuturatamirokagedoroxup.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fonijopinowem.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/44336172518.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c64714531---dorafodupesimibizi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6e19d8add3ce100deb6efa80b704fbc5/lapifimuzezuna.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lutaxusomejokosu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec1047368---26981333157.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/80d1500e3eaba0e45bb6ee15fb494637/85193517681.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771006b8ae7---gogomuninikexezerobosij.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/digozidaxozinuna.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/95107558129.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/ravuwebozono.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aad634de7f6---kogobupanif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cortisol+and+immune+system+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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16456 bytes
SHA-256: 704e57f9a5c5e4b6a44e9e6630d5aa3a4ea2037588f8f382b0636501ed6b03c8
font_01_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 10904 bytes
SHA-256: 3ea07379e28c434e97806bfeddcca2111aacbf0436925e8b93d3a564f0f0ba07
font_02_sfnt_off00011a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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