Malicious PDF — malware analysis report

Static analysis result for SHA-256 c853fc3c0961213f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 21:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0096b6cccd01d1312b8ccadabd89f65 SHA-1: 8e4cb14894d7ff92f794b393007441d98155566b SHA-256: c853fc3c0961213f722bead20b4eafcf935f6b3f9bd0731325fd95d835dfd7fb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves redirecting users through these links, likely to a second-stage payload or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pkynfe.net/userfiles/file/44745899360.pdf In PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/41656808028.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dutimegaxidewozujanov.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/10166110232.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/da4df1ac5c2cb6c0aa1a66561b293c81/xurokoxigajoxif.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29a026296---77311685769.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/woruwitilaxuvejabizosalus.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/15888455873.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/sutijemefokagog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m74tpbr6hdnd0c7j6bs23md1a6/dasodim.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/ludumuzamalakegesuxitimis.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d844d43992---4370441514.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/jilojuwolufovogidajumuxu.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82334906112.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/moviripokoxebesen.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dcbb50a7b---mutapodetazi.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/kemixususotamuj.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/45667660884.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/17639473648.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/lojulumezexakivikojikalo.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/fizafiromabatulike.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/e042e9cb8ad28e196defa3f3598b8fb2/zevamajasivit.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/15343508340.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b605c40d741---lanafofujovisogud.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/gabedaren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=financial+management+theory+and+practice+solutions+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_off0000cdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDA 11256 bytes
SHA-256: e8495106057c51aa6ee54b057b4e2e943f1c31d88c264d9cb570cd1b6dab72ed
font_01_sfnt_off0000e7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 17096 bytes
SHA-256: f9abe684068768d55d75aff7c06a89f01fe0652adefc1aeb44768ccf02c34196

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