Malicious PDF — malware analysis report

Static analysis result for SHA-256 681599b2aa4d5d9a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 05:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: abaf52d1add3748ff197f5da18f1ce4d SHA-1: 03640a69b70c18aaf56bde6577284b65112f3d42 SHA-256: 681599b2aa4d5d9a82f1548ed4c829f7bab3e36f7630690261b7e2825f5a1024
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of PDF-specific heuristics and numerous suspicious URLs points towards a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://opusbiz.kr/data/editor/file/529545859613a00176383c.pdf In PDF document text
    • https://eletvital.hu/uploads/files/13017350418.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/1a406c236905b0f482a6d32473efaaf7/80298201088.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613150b08256a---panadewob.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/veminuwepozakunuzefoxo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/nitigudapogona.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/parizusufetajifajajug.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/56337052818.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/33643159950.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/ziliwife.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/lufupegenurik.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/78851850118.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/dupokoputu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/kotupijilefazejixejo.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/53884208160.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/dodoraxazusukopumigosowo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6ec3f4e3---90387572905.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/nakidujixakomemejamiso.pdfIn PDF document text
    • http://synhbio.com/upload/files/74331275691.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/16221988422.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/vexibevakif.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xirukazexirulawi.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/fofufiwiroxuz.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/darovunoponez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+abp+ad+blocker+for+chromePDF 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_off0000c156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC156 16248 bytes
SHA-256: 651f259d94cbfeb4ab4e1a6c663e7a18d064f0fb13ddc0693d395e645a0b6f5b
font_01_sfnt_off0000eadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADD 10848 bytes
SHA-256: 1ae741e85dc7dbfeb7b41fc8f089d0bac80b2d10e2f15ef19265cc6d49da9959
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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