Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f4a7c80cac34a4…

MALICIOUS

PDF

81.4 KB Created: 2021-09-01 12:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 397b1941a6a9a956f52a02cc6670a88a SHA-1: 809f4d22c6a3442e7a79087be3c2e88e28f4d06f SHA-256: e7f4a7c80cac34a4a8afa61b2292d8c558f79c35383be600193f945495facc76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself points towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d7b051cb00df95eb64256d09e295ca20/38182445101.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/sexapalavetiwufariv.pdfIn PDF document text
    • https://ags-car.com/upload/files/kakanawadurafun.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021070101001073499.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35fae8342---somim.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/77213491919.pdfIn PDF document text
    • https://cargotavio.ru/files/file/maledavasege.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2a24b788---33797198628.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afc1145ac06---dusawugivolatefowosapone.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/wokaxabub.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/gafidovo.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/52739264443.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117263087e0e---21795802895.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4d1404c2---vinizifatogidufuzuxid.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60dc9050d---vupuwojubufukepo.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/c1edc7fdfc5625d53171555214ae5112/gukozazikodusafu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/sipisur.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/7477053522.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/78a063284001211ac2c13c50cce8c575/27586845505.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/rabikibatavizus.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a90b8fb1---28750825202.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a5e6874e---62583805912.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/81594261470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=not+able+to+edit+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_off0000d9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F6 17980 bytes
SHA-256: 80e577efaaaf7cd1781da2f39135d31fc73eda5cbefed3b3069243ccfd66fc35
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 10236 bytes
SHA-256: 6cd854b57b5b676478359910e0a43916cf8f47b9bb6730995ba6039736e9b154
font_02_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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