Malicious PDF — malware analysis report

Static analysis result for SHA-256 355c9a2f0bb291a6…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 05:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c977a7520e9b5e8b7ae72e064333194 SHA-1: 318b1bf80d239f6b98ff85618492a4ddada94dcd SHA-256: 355c9a2f0bb291a6c3bbaaff34082263b098ef1cbc357c503a653be5f5e04de1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://laborke.ru/uplcv?utm_term=car+sales+training+manual+pdf PDF link annotation
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/5458cd79517f4b465f8fef6ee4f1c7d6/zabix.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083acfeb6bac---47619120186.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/konapalenemulajuwu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096267f44f0e---megegote.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/kibogumobatuwivevalumil.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/65047309667.pdfIn PDF document text
    • https://susta.vn/userfiles/file/vexeto.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/radf56ojtjchjdfhn8tfjogjve/13676810249.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/pudexogoliwug.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/moxizalujozos.pdfIn PDF document text
    • http://poorclarescork.ie/images/xonaferusewilax.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/74082351178.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/34775992838.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4663eadcc0---88967312924.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///47776408369.pdfIn PDF document text
    • http://maidichike.com/upload/files/29236337814.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/41901808631.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/fosivawawuvibafa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/2213ee33be937906fb83f6bb9d06625b/rozopulozofigof.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072f808709d2---lipaxulororive.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/ip3h5lai2mmnu5j3n3d3lk5sju/94861312871.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/6721a9f3f589bae943746c60446b00ab/xotak.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/16145598842.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/28231079735.pdfIn PDF document text
    • https://icbacademy.com/upload/files/51732150226.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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10852 bytes
SHA-256: acc33aafa43c2722f4cf6f5d921b5dd4e07404a47eba4fe2ac0324f3592d3c98
font_01_sfnt_off00010c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0E 16868 bytes
SHA-256: ce4cfc68819796e01246197e762d304a18ba237d299eaa85dfa82b93174db9a1
font_02_sfnt_off00013809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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