Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ce18e59cf45668…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 15:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51c98ead7e94e7f8909e96b6706a5adf SHA-1: a7e1db23d35c31df0fec39a5764a5acb8fa6c4d9 SHA-256: c9ce18e59cf45668d548eb85c253881e746d4eeb7720bad53c91d0a172caeb33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. The PDF's structure and embedded links suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921931621ba---63268886193.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/gv61jlvcni7lqg7nk2bbnt6ira/15460988171.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ece9c2d5b77eef308af80f9cbeb448b0/redonefesakefekojuz.pdf
    • http://cristal-in.fr/userfiles/file/70860054747.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/90cfef17bcd1b8ff891dfd8e7ae25561/biwipa.pdf
    • https://wecareprogram.org/images/file/xajakaxajunubo.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdf
    • http://zulassung4you.de/bilder/file/45563317639.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d021f17d2e---pupojaguvajanudute.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d4d629c4---difidilitujejiba.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/tapemobixuke.pdf
    • https://farmstead.tw/farmstead/upload/files/56628891760.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/pakage.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/jf8tsokiddlb1ss1p9id3ot523/57067199950.pdf
    • http://fullx.net/files/93228752224.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/48056f7c05ce08078e9d4885f5d320de/88939935126.pdf
    • https://advantagelic.com/singhania/downloads/file/titodemetenarixefesakubut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=letter+to+a+young+scientist+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b4.bin
7af220170a7a575dae93721cd840bd9b76411ed0c1779f08e63284e032bb5cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 17368 bytes
font_01_sfnt_off00011e43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 16792 bytes
font_02_sfnt_off0001365a.bin
db533b79ff7bedcd99381ef9d2eaffec4312553219a22b005e51c85aafa14e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 10920 bytes

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