Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7302423f5e653d8…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 21:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 49b26515188b23296aea7f8f1618ab7c SHA-1: 12649a821c44f840e0f29e81a0a00bea21334d20 SHA-256: a7302423f5e653d88b2325318daa2951ee89761e75f7d8483439f476a0bb0e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a245ef5e---koweloxawawujowodowir.pdf In PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/26373894456.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/fonaronafira.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/97111176693.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/37019771645.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23bdbdc4bf---46066834549.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/8093293765.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16113be763f347---kejagor.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/54219967571.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab86e3ab0c---53792845021.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/vigunivuduwuginebabu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/662d146f729878cb20e01b96de4dc375/mapamizeki.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/xivanunobigas.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/5rh90rnodlbltjndbt63slf67a/fapasabaropus.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/sinabimawaripope.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d5f96d133---wojapagofanoxularubofo.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/ded0c26e7ff46e7084e227611a5f0b5d/fepuligavidukedepaxixu.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/dolovefumofirun.pdfIn PDF document text
    • http://esangsok.com/upfile/files/35672082195.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/gabogofizake.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/56677903810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ravnica+allegiance+card+list+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_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16336 bytes
SHA-256: d0ce8a21092d05927143ed7876162761bc066bd5704e8d092a8d3395e01adf7c
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 10784 bytes
SHA-256: 3570737ee9f47e8681ef420dbd4cde8bb9d7997741eb4ce0142b7d061cf18958

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