Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bcec527eb2245a…

MALICIOUS

PDF

75.6 KB Created: 2021-07-15 16:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 970eae07395f57df9276ce8881477e4b SHA-1: baa2522b45cd2890d65e565fc3ae5e43b1bb03c7 SHA-256: 58bcec527eb2245a26974a59a78008c31ab9ea16737d143d1515f17cccfa4071
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely intended to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://hoadondientu-ptp.vn/images/ckeditor/files/96452449235.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jsgfpnos2koujgfse1bno9blqn/78113776636.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf765249dac---jadesib.pdf
    • https://wecareprogram.org/images/file/pusizubo.pdf
    • http://ascensionchina.com/userfiles/file/36747920923.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ce0dj8iib5ev2mgjdtvq5k4r97/wosegalebe.pdf
    • http://bagiez.com/userfiles/file/82752651580.pdf
    • http://519pf.com/userfiles/files/pobotaziv.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/38615677523.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/f052ca132e02b84918dc2b7dddb2df54/84503468318.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/8c70bec185c8e8dde291a70f9b7bf68e/99906947436.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/40464087903.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/67116858677.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd20740f861---51718659818.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/521114b37c9223cf14f0975b3730c218/64765076524.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eda44a38c4b---depafojaziguwogixowe.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d51c10e9041cc83613b2b3e3de7ff5cb/buzadadimij.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0frfh7hvqe5k4b2q5acur9vi96/83167494991.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/03407f17355a76e5b246ce196865483a/midukadenunu.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0252f320---wasat.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/71674258753.pdf
    • http://csptech.net/admin/userfiles/file/tujamugilususa.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/5a5b0f135c26b031514b6ffdac1865f7/15510240666.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd0987bf3---5754431284.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=give+me+address
    • 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_off0000c74b.bin
5484f5132d30b2fbd346e5a87e330f9149deb0afa30725ff3186293da733d4c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC74B 16648 bytes
font_01_sfnt_off0000f2aa.bin
ab408d0b669708a891907b1365f7149cdc31a3e07628f384e886f4f15e99ce5e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10144 bytes
font_02_sfnt_off0001095c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes