Malicious PDF — malware analysis report

Static analysis result for SHA-256 c358eabaec8b0e53…

MALICIOUS

PDF

87.2 KB Created: 2021-07-12 22:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 19ee832e5cd8c328ebaddc1eedcc2040 SHA-1: a37f386f62919bd05af1fec652192b0f60f4fd78 SHA-256: c358eabaec8b0e533bc1e855175b77635c2d297cc53656024cf485341d40c0fe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or attempts to trick the user. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to host or distribute malicious content. The presence of multiple unknown URLs further supports this, as they likely lead to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/7290aa638f9a5a93c954823f1885ffa2/mibijirosejaxisejuvabis.pdf In PDF document text
    • http://bocghebinhduong.com/media/ftp/file/modokagapomip.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba89699e02f---56106256710.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/30354035094.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210529023157.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/71122928991.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f0226599---22025894760.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/30f257ca5e7260819bd39ef68095a05c/35744681175.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/73kg7krtmp4v8i8c3asc2csk34/83964719850.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81e714e35---37992205177.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284737d09c---rawaxujitakoparinuretuta.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6353c7bc63d3f1ed00dbcc6b3bef1923/78527485110.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b5244aaf---76818911818.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bf3c31567d539117575a25db024e57a5/45727140801.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/jirifedepojujowobevabemil.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a77cba24---jipebekorasesidadeju.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073020a1e6d9---57770437064.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/33391016979.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d59a202351f2b519948ac11b927c1aea/61159741430.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/besasunav.pdfIn PDF document text
    • https://papiratisk.cz/soubory/34513020290.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca61e9976c---53427167642.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2e18b0291531e854c4e9a6c09e9b660c/652611241.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/wixujazowebusa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bf048a08c---voxefetuji.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/tavimamesuwavasofamazokuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=joints+in+the+bodyPDF 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_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10280 bytes
SHA-256: 75acb88c89e5a78c357139787789fd27672c558ebd8b7213e89fc1b2c0c349cd
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16456 bytes
SHA-256: 4dfd3b6475dcadfa713172c45f8ff8384f7c9d3246853d8abe9683433d394dd5
font_02_sfnt_off00013798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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