Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c047cb1e1661a4…

MALICIOUS

PDF

89.0 KB Created: 2021-09-07 05:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e128e2aafd392578662a85699d441a82 SHA-1: d9993a46d13a248e6c46e9ea54097809376257ed SHA-256: 92c047cb1e1661a4c1aeee0da65be4561514e317f7530f884529c8f17ddcd22a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to distribute further malicious content. The presence of a 'download button' lure reinforces the phishing or scam nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://songhong-thudo.com/img/files/46253392120.pdf In PDF document text
    • http://centrons.com/uploaded/file/98370620860cc1ca8a3ff3.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ihhu6584eb76uno589p7b5295l/99203089484.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/81251730632.pdfIn PDF document text
    • http://dfanchem.com/upload/files/xugizavi.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/69455862943.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/aim1g9makebtmrsqrjund8vu1k/lixadufemovakefimekubu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6832644ff---gagadopadu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c690ba180d48968834b47ca50b76793b/568024363.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h4gdp23n70b34m2aa1j7sleua4/26978536584.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9208542e5ea74c645ebb6e239e33160c/58414244806.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/bowagokezakid.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ded57eea0023fc3824d0de857b38d24d/xifob.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/rilopod.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/nufofizijigigumuzem.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/mowike.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d22cd09f---23070702922.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/a9bca4a288720b016e5dca192ab59a8a/luroxarobupe.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/74304135993.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/3523837080.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/99865058891.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/sedobamudinikexifoja.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/12955097230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=trusting+god+day+by+day+pdf+free+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_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 11076 bytes
SHA-256: 7b322b2a00b371a875f514f3fa5f96c54f273997e2ae1880a46166dc3386dba3
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 18984 bytes
SHA-256: 19812933edea5435da95b6e73336efa70fe054a96212614ef01f2cbd6df2a85d

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