Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c952757b66e95d…

MALICIOUS

PDF

101.3 KB Created: 2021-07-25 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca1c82ba6613b9d860bcfb53205c6130 SHA-1: 1b4d9b9158527ad78e53958fa6bede0a4565735e SHA-256: 21c952757b66e95d2828f66ded51708e8a116cf278639df1bcfd1da8b69c78b5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Multiple heuristics indicate the PDF acts as a link farm, redirecting users to various compromised websites and potentially malicious IP addresses. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kecbktm8i4vd7ij3sljn0oe7kj/jilerilafejutujunoretalan.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/8dd2660f3de53dd159d8cb67017b6918/dulanemu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/910ecf5fdf3971a4fc79f2ff6f4e5785/19661053728.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bef09a8e5---rebux.pdfPDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/33c2f4f1275484e554c8b47429c368aa/sunoxidotowoleto.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160839064f3713---matereporapanew.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/99642503081.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2340edff0cbecc3a63c278b45ad4ee77/71147598872.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607113509b89f---korotefopimepirek.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/69101796291.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca126d9f10c---rijokefupo.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/16962964202.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef1050598---92460751093.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcd879a736---88717080743.pdfIn PDF document text
    • https://kawanmto.com/contents//files/12884868407.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/zebutunopugubifipuz.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160897fb96eb15---repobetukabujuxasimurisur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1d2b67207---pulotizogop.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93465312242.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/57554559688.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/99418687761.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078051f2a47c---21622880970.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a04a9a8cb247ccc47302346ebdd10e11/jabanamaretixulef.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/93872497695.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/meliridujutusilut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+legend+of+zelda+the+minish+cap+gba+rom+frPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 11228 bytes
SHA-256: 99291d52109ad63283c7608d4e499d2efaa7485e106599e9c5d3514eb0846a21
font_01_sfnt_off00013166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14973 3396 bytes
SHA-256: bbf04e219e358701f156d6dfe963df44cc2b6da9fda2da6a5decbb01c942b0a6
font_03_sfnt_off00015743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15743 18048 bytes
SHA-256: 78923aa3347db72444eb98a6cccb9175eccfeb9c08c3e2d2490f005ba56d1bc5

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