Malicious PDF — malware analysis report

Static analysis result for SHA-256 781881d4c3ae5c42…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 05:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1be3f84754e3eacd877c123e7040a9e SHA-1: 0a1be1e09ec302599d354507283a76f5b0ed5759 SHA-256: 781881d4c3ae5c423d014bd88fe6543a7993f0db008aa2bb25004fc2fdd55f0c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, indicating a link farm or SEO poisoning attempt. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be intended to trick the user into downloading a password-protected file, likely containing a malicious payload. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://igescanada.com/ckfinder/userfiles/files/kadakesejizemubeniviba.pdf In PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/43304807424.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b864c537c---zilomizujiwiwepizijopa.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/57860060947.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/26704335356.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lekofijujupevijukomomuwi.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/devokaxalopumekerako.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/togamuvoguwupuzug.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/gamapofiketukolal.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lefofizaluvapapanejeb.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161332b7061d48---xunuwumaxomazuwog.pdfIn PDF document text
    • https://pecintajp.com/contents/files/59035742487.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/62899563540.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dpaeun5itg7hocfcuch5dq2qd1/20445259857.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d8715f5cf---pipizege.pdfIn PDF document text
    • http://eternaseguros.net/files/files/1298431109.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908031148.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/godasogunebide.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/vasarivapuv.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/67345954209.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/73395655418.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/27644598045.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/17853740243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=monster+hunter+generations+ultimate+androidPDF 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_off0000c34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10788 bytes
SHA-256: cbc2118ae1a87a5fea564044f6ea48c713035ef031e1111df2c2a0827c7908a9
font_02_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 18180 bytes
SHA-256: afd5f33bc289c0ca432a95c9e4a306c0e0a9434213e076731b0b2cfc25524ee7

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