Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9555a7216caa346…

MALICIOUS

PDF

83.5 KB Created: 2021-07-08 07:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8c4793146a3780bec81ffb35ff30d6e8 SHA-1: 46f7cd9aaee2f78891823b0256f46467e8c3fe7d SHA-256: f9555a7216caa3468f0db7675bcced2aa1a45487eaef170fd720830731c33642
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=ampere%27s+law+derivation PDF link annotation
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/89921932401.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdcf17434f---tusiletawulivudanumu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/69193633539.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vojokipojetujar.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/3f3a4ae84e98b41bcd27ff385e088a6a/gelokogevuxuwozifamesibe.pdfIn PDF document text
    • http://htwy.com/upload/file/guvevugiwumopemida.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/vogevokafegoxavomazo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lemamamavutun.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/vemilikefev.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e5bbc09ca---84491594239.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726ca0a8053---14802136593.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5453126a---vusidiganigajunarekonor.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/91579338967.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/567c88094ac93279c43475cd9994e2ef/lasazebuvugisexinubefepu.pdfIn PDF document text
    • https://kalewebsatis.com/calisma2/files/uploads/55372206717.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/dd5c1c8aceb8f6888e924c0f236313cf/81468703080.pdfIn PDF document text
    • http://ktcz.eu/files/files/22511824438.pdfIn PDF document text
    • http://ubest.ru/images/file/12334862476.pdfIn PDF document text
    • http://cci100.com/clients/57496/File/rugele.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/taxebufaze.pdfIn PDF document text
    • http://asustainable.com/global/file/xafodanobisasutisodo.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/38150369378.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/354d2de89456fe95abaf38fbb4bc4cb7/54340827132.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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 17528 bytes
SHA-256: 4e4522ae62a3c0a646ed216c988cd00715c5bc6e0b73a2a69f471979993b88df
font_01_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 10720 bytes
SHA-256: 88ebb9d1bce59fcc589c58c8838e62fd5a6d891ca5a13db89665019c5c561ce6

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