Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6410549cdfb0aa0…

MALICIOUS

PDF

87.3 KB Created: 2021-07-24 14:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a84c4bff9b3e22ac3d43b07064cb062 SHA-1: b87988789d772f93d5790846bf8da19b2af1686c SHA-256: a6410549cdfb0aa07384a59c7a392cefce09b8adad82fbdfe6b80f5c4b830aaa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://feynburg-uhren.de/uploads/45444349361.pdf In PDF document text
    • https://mimpiindah2.com/contents//files/xazowiwutofubosota.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffe7b34b2---5186241973.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/35910066580.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/49547687377.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8c5c0c55---bogavabixuge.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78976702621.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/h91g1tn5kk8smd1otk9oemnedj/59421427779.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fowakolulovuravenupipuka.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766e4a04bc3---93662775015.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd33c8923d---legafexivupataxorulo.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/24627141294.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/12689007479.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/gupevador.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1353a597---52596600372.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/tetisawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573b240c8c---xiwuvozabami.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/74590276442.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/xuzowez.pdfIn PDF document text
    • https://datawire.gr/files/files/tomomudijivimetixafideji.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/4ca1aa58ed56e681c4bf86b977aeba68/98333359385.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160881c1b1adb0---49787926320.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hetfbvcjj64g7gqlfuvdg8o6r2/11606171482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+turn+on+a+goodman+furnacePDF 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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 17184 bytes
SHA-256: a4b4a8e07799f2baddc8b8a3820875d0a6b68a75c74d738aff2d805548eae503
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001364e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 10692 bytes
SHA-256: 5eced248ba94931bcee617dc76ff756c5b8c8910e8e59551edf8fd725a66aeaa

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