Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5374c4a83483d64…

MALICIOUS

PDF

91.9 KB Created: 2021-09-03 20:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb70d4517290717804d0c6679aee540a SHA-1: 3d78e8c371f383bfc5795e7e8265f39a4c20fbe4 SHA-256: b5374c4a83483d643e6330c885e6acdebfc454c9b2085acef5aee8a469fb165f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The document body is unreadable, but the heuristic findings strongly suggest the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://acgroupenterprise.com/userfiles/file/79692979335.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/ludafotasivipezukuwaj.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/gezasojaxofixeji.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/82125206460.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wewuxofiworog.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57a1c39a99---36437718389.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zejofademikuzasaf.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097413919686---mozosikatewe.pdfIn PDF document text
    • https://aokman-drive.com/d/files/54942978498.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/10903903930.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/wugasasixeruvobetiram.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/vijomul.pdfIn PDF document text
    • https://factinet.com/uploads/files/rifunoje.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728dc09fdbd---pujikikazenewuz.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/8950203444.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ihj2ct30mg4ij2bsrl76k8etoj/bamadivutasadeza.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916c7739902---selutubowixarixumaguniwi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb434e411f---paguxik.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/jijopikaredutino.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fd4ea4874---71393827002.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160728d88b7eb9---tagogelizum.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2qf7264nuuvkao46e88pnlj5rk/280519234.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fb8655a154438857552ab8c9e72837e/zotizakoxuxukujuje.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sejeligusaserawer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ajcc+lung+cancer+staging+8th+edition+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_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 17972 bytes
SHA-256: a6d3695bb52d52f11dec2be9176aa3a490909b02e204096cef7bf83f575e0194
font_02_sfnt_off0001473d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473D 11316 bytes
SHA-256: fa570bfed38268d4fc223381a6ab82a47f88213c82f3a7cf73d4246f922e08cf

Open this report in the interactive analyzer, or submit your own file for analysis.