Malicious PDF — malware analysis report

Static analysis result for SHA-256 555baa08ade96d03…

MALICIOUS

PDF

115.8 KB Created: 2021-09-07 04:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e794b285976486db64a89aa1e326cd75 SHA-1: d5d52cecfe9fa24939c6b4676d66523e5f97d825 SHA-256: 555baa08ade96d03f997484864f585ad6088db85aa777787952d52b22c7e38ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external URLs is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=approaches+of+rural+development+pdf PDF link annotation
    • http://eventechsite.com/files/files/goluxesifidifozafowe.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d8a9de9f---rodumobejoxuzava.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/65936243122.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/pixunufaligajasexotifujap.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/cce843a7daa7bbc2785e74bb11b17c14/86749300921.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/0avbqeindc7nelk6qddrroube1/37669116488.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b50496476d76bba21fb3f7993c4ea41c/tibozipikovutulonuk.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/jamomobamimadinowulaxin.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/lodavorej.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/fupubif.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54ce909f88bbee6e56feba15dd120f4f/dimosugazepadili.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/vujutitigobi.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/vorevatotofimibejuku.pdfIn PDF document text
    • https://bloomeng.com/uploads/23480842461.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-8-15/20210815134532287019.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6fe021a9---zovaja.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/67496443327.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/270882e196f321ca597f00b36da9dbe6/fipapuzuresakigilapis.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/pebuz.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/22931086603.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h19t9rhh4oosfbejogi8rv5vb3/61541465151.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/3589291507.pdfIn PDF document text
    • https://emmaushuis.org/pages/16163869102.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/detozu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/51265875550.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_off00015cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD2 19632 bytes
SHA-256: f16b1cbe2b2ad50c92d0f438d1921df23b2a1cd1c5d571cacbf74b24c855292a
font_01_sfnt_off00018f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7B6 10940 bytes
SHA-256: 695b62a36e640dac32ddee06bce260ae8699a9a9991540f33190087805fd8841