Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e9eb2f9df4ffe5…

MALICIOUS

PDF

93.6 KB Created: 2021-07-16 08:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f77999c4a0ad99e73b529ce9703da3 SHA-1: 2c40d2a0c8ddf3785d77251523e52e1860ac677d SHA-256: 38e9eb2f9df4ffe5d098f7575b36fbf3574a8b39e9b733c9605adf0c0929d7ff
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

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.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9095dbd10---78450671357.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5a9ddd3af---vewiladudajunurikovediwul.pdf
    • https://terminal.hr/userfiles/file/11104292623.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/a5a7f955b9fd19aced34e13205651350/89687382894.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/43cb71100ee1aed54e46d9ced20b16ed/tuwedup.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/liratikegetime.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba23f4af8cc---71931469075.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7adae1dc6---wozujokudu.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/badonowidukonimuburaw.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0c94mnd078av84iueddtb4ffs6/58314818707.pdf
    • https://samudra99.com/contents//files/zutewanuze.pdf
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/13170671559.pdf
    • https://marblo.com/app/webroot/img/files/36242939504.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e8932fec73b878d4bbd019f1131343f6/9855686500.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a395e94f732---63147842520.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcc7796afa---bezufapitozalegenulakur.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ngeom9h3endmnpihmtmes9qau5/58372025431.pdf
    • http://rhondachem.com/d/files/raputurepojifa.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb772b0a00---nevojid.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fab0ec4f3---42521642287.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcde1b5c05---vebakugit.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/kutukamagafekowexu.pdf
    • http://ort168.com/upload//ckeditor/files/xavavosazekor.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tqf8s8d0ajq484k28ab9mlaqc7/fagino.pdf
    • http://www.benyowsky.com/resources/files/rididigexivipuvuvugolo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebb5faec40---35464553510.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d04568349f---beboxixopepid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fruition+meaning+in+telugu
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011ab0.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11AB0 18328 bytes
font_00_sfnt_off0000d490.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 3464 bytes
font_01_sfnt_off0000e20b.bin
adbab19c455e461f9f1fe74bf4269f6f4f3006c96058309294f6324411c12182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20B 23060 bytes
font_03_sfnt_off00013852.bin
17cccb2dcbe29be7cd24083642d7061b0fbdcc3781d0e9fecf998059d4e0dd82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 10360 bytes
font_04_sfnt_off00014faa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FAA 16792 bytes

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