Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d315e9ea453e2b…

MALICIOUS

PDF

83.7 KB Created: 2021-07-04 15:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81e60de1a5a8a20b11ff1db9bd53719b SHA-1: 8333bab930da80d4a1da80cda4250bf9a830f93e SHA-256: c7d315e9ea453e2bf54033d3495a67f0e87ccd0bd83775d4e14a69f3f912f85d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by its extensive use of external URIs and link farms pointing to compromised WordPress uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://chcial.ru/uplcv?utm_term=the+way+that+you+trust+me+ariana+grande PDF link annotation
    • http://dawahcity.com/userfiles/file/31734383759.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/81e3577a683e8f0b50e9f3eb71653445/16287595670.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/10947042162.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/oo9e5fmi8ibi31jj57v3h25402/38891405232.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/42020137735.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3bcef4bf5763aabd22ccc799a49e08b0/vepilituriligarafowulet.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db59572d2---tuzok.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088444acd00b---gubuwuxopegulubugara.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e60f3840---leboxedig.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/828a6cf57bff64700f8781f2cede6d15/lovabi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18ab2b122---50241757384.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e9f5ec34c5d12419a54d449e7686ab93/75925897558.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae64d6acae7---fotejojulab.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h26ajootjhs6q1p1qc5fnkikd1/vutanesuji.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/88792849641.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/23718585487.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8924db16---fujonabufuxiwut.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/turif.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b2110be0c---55475984184.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3d003ace6fa2b6325671c33b5e563360/nipukifikakutoxusozusepiw.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/629c17d6f62c2627f53f2bcbd6bda381/nokugut.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/18289163610.pdfIn PDF document text
    • https://immobilgold.com/file/pefarokolapoged.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-2/20210702022456496631.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/berupek.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3n0je2a5bg9qdqgng03mshh6pd/7723766117.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10912 bytes
SHA-256: 5050bf2b711a4a4b91155c23a156bae1c65f8c83d49d933c9ac36bb3aee626e1
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 17668 bytes
SHA-256: 97396de1c9ef2dcb21c38a51c556bc2eb23bf49ba9b0cbb43b2fd6fec93592dc

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