Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea80df9a82dcd28…

MALICIOUS

PDF

172.4 KB Created: 2021-08-01 10:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51559852cf68136e4b196efc12aa1f59 SHA-1: 1394b6d78b3595c0f86f1b3e1fd29e0d624bc175 SHA-256: 4ea80df9a82dcd2823362e43ae95e859849fc8cb3984a0bd49906ea56333a0f9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded links suggests an attempt to redirect the user to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3d7471870b---97848091093.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/lanupukofomuduxasivudafi.pdfIn PDF document text
    • https://digireg.it/upload/wamizajixumerime.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/17866017112.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/b85a203ec1091fc077cfc74d35c3b969/romakixavulu.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/52734946840.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/xarazamugo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd518a46134---rotazaberovobutovigebi.pdfPDF link annotation
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/vupodup.pdfIn PDF document text
    • http://jhroseclassof77.com/clients/45984/File/16494315835.pdfIn PDF document text
    • http://labonscafe.com/userfiles/nulotem.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07e1c8882---18695896526.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/36cde7c26beb0f991046977850be15f0/60736487688.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca9721552---63867697855.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c1945af1---lanitaxanosikavewawimubav.pdfIn PDF document text
    • http://446888.top/userfiles/file/doxatevudesus.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76a5549a4---dopanivakafagoworiz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d6681376934d675b3391911f39ef2cd8/67684231022.pdfIn PDF document text
    • https://tepihtrava.rs//files/jalifotopunubek.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9anki9smsl718gk67rvbphtfv9/ruveb.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/c5ed257b5d187f18f6697b7dd99f9585/98075722696.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/lekowawubajit.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/kozijujipurubenadedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=life+cleric+5e+guidePDF 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_off00024329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00025b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B3B 18132 bytes
SHA-256: 47faaef31ec571248d7ba9b49c288f5ed57854db8a0ec6e031dd7adb8a6ac8be
font_02_sfnt_off00028aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28AAE 10188 bytes
SHA-256: 5854672ffa2043c26cf4f0cc350fb093e310cab705a5b5ec361735596671e0ee

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