Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8a65f0d10ad2c0…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5ccc1a3748ccf61f4fad1b23edb5743 SHA-1: 486b4314f07f8f03b0107635d8b4724a6f434fd8 SHA-256: 4e8a65f0d10ad2c06832b6fad3e5e18820b717570fb12878022f1d9a3c3d615c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=classical+and+western+fusion+songs+mp3+download
    • https://lamthong-marchph.com/piceditor/file/47726032463.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909387eac95---78667825430.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e8e84b16fa47700e3326a6b5a8cb5fc5/podobakakexafu.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb375e1d673---56725605827.pdf
    • http://tele-video.ru/upload/files/61061680516.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c76e8b05b---tokezimalogavulawakemum.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5b1886258a1fe2863a0d51c7e528f171/kudot.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a651f9419a6---bevuxasop.pdf
    • http://gfhs1978reunion.com/clients/56625/File/62829629715.pdf
    • http://lacasedescaraibes.fr/file/30514235882.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfe11ffed---didejilivexilawonoveli.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/66075224333.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094634fcfa53---49944825053.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/86109141b0cbc612e2af486bbcf56dbd/88624731511.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c69a1e3bd---mugopitelodirokusudipesa.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d1u1o214q3lgrn9t04gf20le53/ranuxixonilifowubab.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acb48684856---24170182373.pdf
    • http://el-master.ru/userfiles/file/wajikedurisiromumagoxiv.pdf
    • http://nontaromclinic.com/ckfinder/userfiles/files/vaxakukajovesudakewo.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f24fa153ec---38167467485.pdf
    • http://gramercy-grand.ru/files/file/87405480994.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f422443---zusek.pdf
    • http://phantasos.org/userfiles/file/76161923279.pdf
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/maxif.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_off0000ec70.bin
fb363842c727c6e95ee54587f57b160c3bba9ff1f7d79aa15a1ae644aa49dcc1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 11352 bytes
font_01_sfnt_off00010707.bin
98e60b581b797bd07434c545b1048785f5e034b61dc6215d5c243166d8915213
pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 17012 bytes
font_02_sfnt_off00013346.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 16792 bytes