Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0b44e36dffd1fd…

MALICIOUS

PDF

74.5 KB Created: 2021-06-26 13:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dac261f1b7f30ab7645ca6b30fe03402 SHA-1: f904b1d8060db451cc7ab5f210de05bb8bbd3dd5 SHA-256: 0e0b44e36dffd1fda74f85eb436a9fbcceb6e4f9b718b4ff227377f724e67009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=borderlands+the+pre+sequel+to+arms+choose+pla+member
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ea0283d2991d991c7b1442d0192a977e/vuvowubiwotopasa.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f02327e99---99000547359.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809e5f262f4---juviwe.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea1396e40---wosomeximat.pdf
    • https://artenika.pl/fck/file/fojobe.pdf
    • http://camonetinternational.com/files/file/36895504837.pdf
    • https://acgroupenterprise.com/userfiles/file/84450973176.pdf
    • https://senhewood.com/d/files/69904988553.pdf
    • http://robwalker.net/fckupload/file/31333656388.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210623_F63EC5CE46A69636.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090316389b28---buzamupebiwemisaxilifik.pdf
    • http://nitexprofi.cz/userfiles/file/jusujapim.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3rtlrh4lp4apk7o2mhvdou33qk/vivoxomewuvikagu.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5df0517b25---murudulutoni.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160aab7e1bf26d---69440787616.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd238d7921---28291384970.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/sogumuwatemi.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/bigexagoduvafinulosisipel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5ae2a610d---powofoloxon.pdf
    • http://adbuffalony.com/uploads/files/86186806745.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c1e761a99---tazifuvikiravefusebedij.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/61954371715.pdf
    • http://cambresisemploi.fr/ckfinder/userfiles/files/3203233136.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_off0000c131.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 16792 bytes
font_01_sfnt_off0000d948.bin
c89384287558e7c770bdd9d5e5a8bec287aa56d19ac3cdba1d9de005e2315072
pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 11124 bytes
font_02_sfnt_off0000f2a8.bin
5fe138334ab5f70de45627026294b1df6a08cc7f2fec5212bf846bf5ad53e191
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 16244 bytes