Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a4b53d791bb44d…

MALICIOUS

PDF

70.3 KB Created: 2021-10-02 11:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a7d50ab10f9852e0af7ab185a9c97e5c SHA-1: 1ec8d4f99e690bcd749b881a521027ae68a060ac SHA-256: f3a4b53d791bb44d20ca728f4ec7f793a7c483e34e0dd2a4e5b210678691a8b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to obscure the final destination and potentially distribute phishing content or malware. The presence of these link farms is a strong indicator of a malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://duplisite.com/userfiles/file/12337093454.pdf In PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/furujedumaxusurululaniwoz.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153260c1e332---zenaxidodusexusanojajet.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/panepu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144293f713df---61126025077.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/dunawuzurat.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/vebasemevesaraze.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/bogufuzivipigudanofafobe.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/50514185949.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7b3d67df---mituxeduxakomifegipuxiwi.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/86887697647.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf95d2faa---58047204600.pdfIn PDF document text
    • https://ratosatu.com/contents/files/14907844391.pdfIn PDF document text
    • https://alohasafaris.com/files/90947704923.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/gazinokonexo.pdfIn PDF document text
    • http://egitara.com/upfiles/files/burezazuf.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/sizibeferukigif.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/dukoxutovam.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/puminag.pdfIn PDF document text
    • https://eclearusa.com/images/file/zawuxawoveroxezekafop.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d7e61402883e096915fba3f5ae99d96b/34250551368.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0341aa5260faf136a0db5cff87cdff19/38900129361.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133c252d69a9---gudufuwurododegus.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021092313564473499.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109170054031353.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/kasonewuwunaposojesuribo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=words+that+start+with+e+and+end+with+tPDF 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_off0000b4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC3 10380 bytes
SHA-256: 4ef544134ee343130c2e4f3afe58b4eef4fb0715b4d9cb961b172d1d7ce06d4a
font_02_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 15740 bytes
SHA-256: 757cd5a1f751dd625827a0a3e821d434e42443de6081e953b385c069bfb2f001

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