Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f09172c9ce17560…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 00:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e47e650140ea4b0465d842db2dc9168 SHA-1: 177bc31852a77ab7ccf120cbdfb9815fe0dca8be SHA-256: 7f09172c9ce175607f27161f9619a70e7a68769eb9b612af03b101aa09f86a1b
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, each hosting another PDF file. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external links and a link farm on compromised CMS uploads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b9f60682828bd3707c0257e97cf6f0cc/pikixuzazuj.pdf
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/sagisasid.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5788df9384500e0080ea9b518d22f2d3/patizupuxe.pdf
    • https://shibbirs.com/media/files/lewisunuvimuvozubozuna.pdf
    • http://propack-th.com/image/upload/File/87876435742.pdf
    • http://benthanhsgfarm.com/images/uploads/files/vuram.pdf
    • https://exihomes.com/userfiles/files/puvuwewaviludup.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614534f400733---vuzuve.pdf
    • http://metalltechnik-kutschi.at/26230021011.pdf
    • http://www.scsk12.org/policy/files/files/lezabegisejagunuf.pdf
    • http://les-dvorik.ru/userfiles/file/fugazazijimonapuperef.pdf
    • http://daithanhnam.com/upload/files/tofidasafer.pdf
    • http://huichem.com/ckfinder/userfiles/files/43020518462.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/54489237693.pdf
    • https://bold-iot.com/uploads/files/202109081530446447.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349a1d3ee0e---kebobapikibekuli.pdf
    • http://artpolyclinic.com/file/files/99913093881.pdf
    • http://climacom.eu/userfiles/files/86444053882.pdf
    • http://acril.ru/ufiles/files/53786225781.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711f1bbfa0---31029220039.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=turn+off+ad+blocker+chrome+android
    • https://unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/zifikidulilivitokeso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes
font_01_sfnt_off00010afe.bin
4775225fe0176f11339616a8cc2837888cb13b30235a1000aaf3cfb225d2185a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 10772 bytes
font_02_sfnt_off00012380.bin
627984c4228d962ad045987f1e5ed734793efbf9162f58fc3127d56a3eb76ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 17732 bytes

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