Malicious PDF — malware analysis report

Static analysis result for SHA-256 310c69ecd19d5b88…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 10:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 033791b750f184b638b1e868d18fab92 SHA-1: af812c91e684166c4c1012e0c815035abdde718d SHA-256: 310c69ecd19d5b88f340fd8c542781f0fab1786fa5641b5c5972e736d2e319f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

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 https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161414aebd5ac0---sakakevuvowogojiwipe.pdf In PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/52266513180.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/manop.pdfIn PDF document text
    • http://royalgroup.at/tmp/mugevuritolikixixikadeluw.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/19321187160.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/89932554954.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151091877e3d---29590595180.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/12157240143.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/toxopivilefares.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/jatofuzidurelefinukizabi.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109201710511668.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/7luc569umneco30p5gfc8nq9m8/duledogules.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9e500cd8f---16598469648.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/xulerusokejimufuwu.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28643308729.pdfIn PDF document text
    • https://kawanmto.info/contents/files/vuzokali.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c11f283---14375528606.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210910152757.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/sixerifuduvezisodojoni.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/17624784653.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f7dd84d301cf52ff08f4ca663dd5146a/29963115606.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/filojimere.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/weporujemufa.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202196426155116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clash+of+clans+apk+y%C3%BCklePDF 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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 14568 bytes
SHA-256: 9a149fd515ceba4a87da13d607ef2094295ddf514673e6d6a69e0a931739f3f3
font_01_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 10716 bytes
SHA-256: 9b31f1731c8bcbf2e0b90d11b1997feeaf18a115f6dcf1c9e2398192cc78231f
font_02_sfnt_off0000efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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