Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab90fa8d0820fe59…

MALICIOUS

PDF

86.7 KB Created: 2021-07-10 00:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 37938fb67fa757d71801a12cb77dc515 SHA-1: efbb9b61785bee2c81a01d4aa11998d437d8a880 SHA-256: ab90fa8d0820fe59c614d66da078e6c8d02e049faf7e036fa9c2c31460c8cbaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, likely intended to trick users into downloading malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jpgudvp9cg1b1bjmr7sfk7k794/wixitamuvi.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608712b16582f---86491706726.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/21711832693.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/julum.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b220341146---tedoluguwux.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/56532339839.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf7c10c8d---88638661582.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/54037018406.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/vawidawozig.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/10149062446.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/95909801763.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b83acec60b7---besatenolupefobamuw.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/noseruvanarobisupunen.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f3dfe333a---12674749948.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fb32d20816a05676ab626c63fb776fa4/77819010713.pdfIn PDF document text
    • http://ipceurope.com/assets/file/61845492574.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/95mnftego5at9ldpg9tj7igtac/59618220766.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/buripox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5259ba719c---12073783320.pdfIn PDF document text
    • https://0900107678.com/upload/file/90177429882.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787314dfc43---68991082807.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/zanelize.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/sujofuresabojojetude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=download+need+for+speed+underground+2+for+pc+windows+10PDF 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_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16752 bytes
SHA-256: 6023a346a5daa94d291123f816acab925863429c4bc96a86638ee043af5ffb33
font_01_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D1 11176 bytes
SHA-256: 234b24e977b02a439b8a2ba4eb3778f29b1fef9ac408f8940f43955986d7d4bd

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