Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd825be255273c1…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 16:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d121a551a1e6a8e3053cc3dce5bc87ab SHA-1: 49697c176fc1ac3a209f9abdbac5090d5e024cc1 SHA-256: dbd825be255273c14a7a81edebc5d6bce29d1285c9361ffaaa5c9fbe95d36688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://e-motyle.natura2000.pl/imgturysta/files/jujolukowa.pdf In PDF document text
    • https://ngusacdon.com/upload/files/gifovotofo.pdfIn PDF document text
    • https://parfumzone.ro/files/file/91020206154.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/63795035250.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xubodolodepabuba.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea46fa514a---soxarusujabagibixulas.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/fawukoriruwemibag.pdfIn PDF document text
    • http://sdes.in/uploads/zemezitodudumugi.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/tuliniw.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/popidugaxokiratulitisadu.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/vabajapakodazobopisisure.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac9be9752---zuxogoru.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/xojiwi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/93s2knslg3n34klke0mh1epp85/bugikuwijuxuwevanixo.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/15881114676.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/65883667102.pdfIn PDF document text
    • http://limoride.net/gallery/file/gibigejabesaj.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/57000508979.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210902195559.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210910110520118.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6e86651e54ada84f8b84641bcffd80f6/85407693660.pdfIn PDF document text
    • https://network-italia.com/file/tuxazukaxoju.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/rinomexog.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/netofesuna.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/gopatidofopegetojetuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sms+receiver+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_off0000b705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1C 10528 bytes
SHA-256: 9a98d10b91a5fe77a015456b4b43293f99e16977194642e58d868306fb78a9d4
font_02_sfnt_off0000e704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE704 15916 bytes
SHA-256: c029743ed73267b630993b875b1a44e6422580c805e26fb5a840c278141cf3cc

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