Malicious PDF — malware analysis report

Static analysis result for SHA-256 93108a09afe703ad…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 02:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fde988fde77cd2f19c986c7425a81b1d SHA-1: 48bd6b85f3be580f5d0f28c73541298ba11c6acd SHA-256: 93108a09afe703ad2a02b35e1796a95aadb7df6f9f544358d779045f235c96ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the nature of the URLs and the heuristic firings point to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=fha+student+loan+income+based+repayment PDF link annotation
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36690b2ad---bimemiji.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/c07dd4b1af23d278e244d2141e0ae38b/53716453820.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/wugakep.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/41264347992.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/6enikoukgfsb8b3s7u6d9js133/nebojosutibaris.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39d67c279---paroxizuparatikup.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892d02d7f86---20837994064.pdfIn PDF document text
    • https://areicon.com/images/file/59503910987.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kfsmttkuf5fu861ut3op3dlvpn/velobaresefijozigo.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/fojeginojivu.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e2036d4d5---kowodejakurarupuxegadu.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///bofufosuwufevoxa.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/65572340205.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/41214524953.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/aaa6585ddffcd2a02844493f5d215372/24346005101.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/noxivoxanebegip.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b8f08360---kudilixebipumajut.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/rogutiwanomukoworara.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/72de529e98e60538e1210eed4a156580/rovapelibobimafokor.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc42106375c---pemutumofuduxidiz.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/11433206272.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d966c2067d---15797094634.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a1045c55e---81009968410.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9abaafc9a623bf24015956cacfef2fb4/12386090748.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023B 17052 bytes
SHA-256: 0a80859ce56f8290e4ba6ca968180c88cebc1f11e1fbe8f1fc5955ec307b04f2
font_02_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 11112 bytes
SHA-256: 067ec840e83516562fe24ef7f683585f183b222e60ce14a3b518e188c67b04fb

Open this report in the interactive analyzer, or submit your own file for analysis.