Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e889f3fda6420d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 17:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f0c720896f4315a0f2fb2ac7ef50c3a SHA-1: 51e8551d660a483d944c7cffa23f0a371aa92c40 SHA-256: 39e889f3fda6420d8b9404d61a47f1cd54ba201683fd8520039685bce7f083f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links may lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sunridgecorp.com/uploads/files/202109062032016179.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe0919ea---naxovusawarudelesen.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-14/20210914180655966986.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/68901539629.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/feliwegofop.pdfIn PDF document text
    • https://projetovm.com/uploads/files/60205144652.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/zefowereloda.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/23214353550.pdfIn PDF document text
    • https://themalc.org/files/file/karibuwojitudaregi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394f7109c3b---kazidudaxaxaliju.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/18741917763.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/ziwokiwixojamo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d784316fa9---87175854891.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tituzewogamotu.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/fofevufer.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/gusifewonebureveno.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/seziwugojawolo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22845806871.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/49701691209.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614347c0d5783---wudukafagaxukavufekebano.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/85084631161.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/81413494283.pdfIn PDF document text
    • http://inistor.com/ufiles/files/jomutepigepizekomujemun.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903032327_1522024910.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/viwopafivopigerebot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=football+manager+2019+apk+downloadPDF 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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 11232 bytes
SHA-256: 2392d1daba60ce33cf3e0a3bcb5271cbca44982a7838342635eeae54044bdc0e
font_01_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 17816 bytes
SHA-256: c05aa6d52e2acdabf4a6409e01496ee37b4f16d11292a3e9b2011a2ff8d5ca06

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