Malicious PDF — malware analysis report

Static analysis result for SHA-256 e617f9d38fe7ecdc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 17:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 29265459983f53ce3c04e189cad496d6 SHA-1: aeacb1fdcc309586089ac8356afe978e1c4a4885 SHA-256: e617f9d38fe7ecdc2ffe326da5c58807694f0072104e5b22b82f34ac06dd6137
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic strongly supports an attack pattern focused on luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.zochrot.org/ckfinder/userfiles/files/radurenukanesukijazukaf.pdf In PDF document text
    • http://tsyrulnikov.ru/upload/file/wezara.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/46186340141.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/laduvew.pdfPDF link annotation
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354ddbdc146---folafimivawof.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/zujesuxolixosavun.pdfIn PDF document text
    • https://mytopics.it/uploads/file/pavitujenizufafugazesopax.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/voxareka.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/lizedamido.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/98174681502.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361dd9d07db---popeso.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/dalapetotapopubube.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/jewuxuxifab.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/5988232586.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/fiwuvosojoxo.pdfIn PDF document text
    • https://renetravel.ro/images/files/72316578334.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/74665900537.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613006aebf38f---89999297927.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f83a198a7---67800770646.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/vagovefezetigipifitazu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h27o7lrletclpspqn2u3liece9/xoronupixeduxakixekaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+transfer+all+my+stuff+from+android+to+iphonePDF 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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 11056 bytes
SHA-256: 12d5b3a3155a18fd229d8f4fc2823ff5161941975a43f6755c41b762bbbf0dcf
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 18140 bytes
SHA-256: 93c22798f89f092f072140c7caf69b173137c59edd6553563612acacd02f1728
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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