Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e7d974664b6939…

MALICIOUS

PDF

91.1 KB Created: 2021-08-06 10:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b872a9ebed065950051ce7b1cce1ff99 SHA-1: 86eea218009145e900e7febf27ef0835e8831e3b SHA-256: 78e7d974664b6939dbe5de3d76b2c95d6fb58184f58c0cae8ebe3dde73102413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of multiple links on disposable hosting further suggests a malicious purpose, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://sotel-perm.ru/site/file/nozewutafevolupejitun.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/38554688668.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/98c33d9b9c3c981993b33a477fbecd25/narugadetex.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/24331048216.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56d410a34---20612828417.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9453733a---gezovobukalebenejofavi.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/lipujisozobadegen.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f79a6f95---miditi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/jp7ikt7hvmp74hg7q6gq0oug2d/wiginabopexerazof.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/fb70c7fdcdaf7afa86a462f3357cfdce/bavesexewupomajobexox.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/juminad.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cbf82553---bijudimofefemapajuvu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4386ad5172---jesakedinajimiziwe.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/19092887169.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/xeduko.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858b965e4bd---15639851572.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/nezikebidawekilat.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/29236708926.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/23565836025.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/xumekobisomagaxoruvexama.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/49828594490.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/13574403451.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sudusiwikemofazodo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/db5448a1ab932e16888ed6a21ac93389/kufisutixobudenuzitoto.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160910995c2736---62231074821.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ae4593651---teses.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=livro+para+aprender+franc%C3%AAs+pdfPDF 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_off0000fc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 19104 bytes
SHA-256: 81bea2d54eef006639d61a86779ac146d149369f8560030a5d44b82748885642
font_02_sfnt_off000142f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F3 10652 bytes
SHA-256: bae11e4b6b20747ea838145dc1c293203d6f8a924e6729e8587541461b3c6051

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