Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb5f9a59f1312d…

MALICIOUS

PDF

94.1 KB Created: 2021-09-21 22:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dfbd8555689c19065b11c9da5bde301 SHA-1: aaf77011521f4e0b615848d319d1ca6d31907f53 SHA-256: d6bb5f9a59f1312d1a2457a97fddc1ec5b7bf2a14b3f6d78bdf2cd7556ef656f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs are embedded, many pointing to compromised CMS upload directories, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://wastran.ru/uplcv?utm_term=world%27s+second+largest+economy PDF link annotation
    • http://medtravel.pro/images/hand_uploaded/files/1779389394.pdfIn PDF document text
    • http://furniture83.com/upload/files/kazenomekuvodal.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/nobiv.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/zowonebaj.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/minodinaf.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/25837288647.pdfIn PDF document text
    • http://belniig.by/public/file/muzodakov.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9796ba48a2e367668f751ded03d16e46/63094288273.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/21986051068.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/darararokupivokedefege.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/sopefuxozekupopuwul.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/zirovepeges.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210908201251127.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/898ee8be7dcd34a67ebc548df11d0799/28940431927.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/niwibifolewej.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tanadezasefuvim.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc70a60699---jipetemajeguze.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/fafuwiregovugetaxasopu.pdfIn PDF document text
    • http://greenld.com/userfiles/zusowusokusudu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/xenutelefifele.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/afd09d61cc0ae32e1775f10d0a50fa46/69416951268.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/50fef53a0eb3e053b585b3d5c42abaa9/54831085814.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/mabegujox.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/wikamabijuzenel.pdfIn PDF document text
    • http://contextuae.com/resimler/files/xalegifalatebivifavov.pdfIn PDF document text
    • 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_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 18608 bytes
SHA-256: b53168e475a8190396d7d7e0a47ab6e832f6f503574e30700aa6cc984e506608
font_01_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15053 10760 bytes
SHA-256: b49d4a240bc0a234213bcc848f3f43dc4a8c0dcf340e7cb52ab4b44efff6d339

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