Malicious PDF — malware analysis report

Static analysis result for SHA-256 342a9ecda9bfd4ed…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 09:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 711342394f88b30cfec6789e8edac286 SHA-1: 8fc1eeeb5d28e3d8b09e1ba74daaddb97f39958b SHA-256: 342a9ecda9bfd4ed3c159ab826414d03e92f1d8aaca61ff082b6f8f4b121ccf9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. This pattern is indicative of a link farm used to obscure the final malicious destination, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ccbcd102---56042635477.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n5dff7dq14l5ehkghcbnoq4qu3/66930504994.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/xifomip.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210822030220.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/kidibupodes.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/ligekuna.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/zofareset.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/020cb0b146affaf1bdbf05fe0e989d58/zoroka.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bf4451f675---napigusopun.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2327de8ea3---87663247381.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e63b7e408a27ecf5e75fc36016931660/32587148597.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1du9u5p5gkcmapb7u5ne0lddq7/xovimefaratiximafixo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c5ce8149---menegaparuwonozal.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/juviwewivesopufomu.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bf80fcae12ee7ef66707b792f25a22d/85905068456.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ljfft0q1c35tb4tt8d7ebt8mg5/61051795840.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/1ad898b69c525a54fc97bbd55d4016c4/varanonezodavedodubabuka.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/35117963271.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bac30847951---91355057628.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/pususa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d83e4525---menodevovonigevubin.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/56390564031.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/mivarakimeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=albite+anorthite+system+pdfPDF link annotation
    • 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_off0000c477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 19936 bytes
SHA-256: 8e7e5c4801f2c97c21b12938d1fca3f998d33872282c513e2d4c4ca9082e2c61
font_02_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 10996 bytes
SHA-256: e63401801a63239c199c81a96b42e8786631725f1deeef67e4eb65a056d423a5

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