Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c051f11a95bb66…

MALICIOUS

PDF

115.3 KB Created: 2021-06-29 10:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e87cb89eca57acf8204ab474533fc46 SHA-1: 92656d197b03433296afca8a9fc0b5106612f09a SHA-256: 03c051f11a95bb66929d8ec4fef9fbf50a9084ffca65ee51545b10666fc6ad1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The PDF structure and embedded links are consistent with phishing campaigns that rely on users clicking through to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9270

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://sanitaerprofi.ch/fckeditor/editor/images/file/14908818564.pdf In PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bedirabal.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/kazovawum.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160862698e3e47---48348543675.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff7c184f4f---73252484497.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16076a01b577f3---gakexobipadonoronurotaza.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/mukenewolanexewakuluba.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca79eb187f---kurowe.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f103c75b70350c44a1e9782f93bbf780/liwafujonesofije.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b143fbbe0255aa0970aa7660122f333d/puragajujojo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/e3oi9hi6ko77l9oqcflik0u8f9/sewusifurimojarijejojoza.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/51714469429.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/96e2c413027982ee9559044ec69dce58/welirukunoberopare.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534efafb78---newixijinejoxaw.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088adfc1e235---sefanojanofuwoxifoxe.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/tujebisipuxoxazosowifesuf.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lkrbh6igme1ono66lvseh6au6/zirepijunud.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78d0be3da4---82606736184.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffab3da5---nevitokizozibonadizet.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/fomatozeli.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc92414c92---fagigobisajanuwi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/melanolokonibewasurer.pdfIn PDF document text
    • http://fotossc.pl/_files/file/dasipifasov.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210609_65359B7096158E69.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcb4f3b7c---dikesusegofu.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/damowenanopolamazoxito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=emphatic+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000171bd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x171BD 27720 bytes
SHA-256: 1225bee32abe31caf45c12f9dc40a618c5c5e22f298ace4053f641a1b5517cb9
font_00_sfnt_off0000ff9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9D 5656 bytes
SHA-256: e00f7e9dafd12db7eb736be2f334cd40d5a81ceaf903814563ec89c991834fe5
font_01_sfnt_off00011349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11349 30464 bytes
SHA-256: a2d859bfd8bfb297db6268875f9d314a3a7667b7c07fb20591e43824a142f7f3
font_02_sfnt_off000159c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C9 10584 bytes
SHA-256: 8e5e3145196932e9642093393822e5b146a72269c9c7f63ea8d8764afe0abfb5
font_04_sfnt_off0001a53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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