Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d10a46262f75669…

MALICIOUS

PDF

89.2 KB Created: 2021-09-06 13:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8af637fdb8df9005abd35467d33555d0 SHA-1: 3f39bd295c6967239baa5010b222f29cae8e0b0d SHA-256: 9d10a46262f756693b4eeda1bcab2c2f208c54b7e1447db9008d9c123e1eb6af
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 CMS uploads or disposable hosting, indicating a link farm designed to manipulate search results or lead users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://hanleyresources.com/images/peberoxup.pdf In PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/gupalurijagabititidara.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/47513338151.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/rudafadumezu.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/jewosuxu.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/668c7220c128c2742e54dab19fdfba39/dewikiwo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6fd15bbb58caccdb72ffee4abaa9c0a9/kepoxelapomamugivivug.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/968ef647003ea161b20a40fce960c2a3/wizoraximefilutodib.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade27fda732---natunagejumizo.pdfIn PDF document text
    • https://anandalaya.in/resources/file/mejemefulu.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210726044320.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/44855270465.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/rclvkjjjn54lb2h5vm6eguhi54/45887134700.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zilubinokimo.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccd455800---sukagukarifupaputusufevi.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/78018821806.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210701182441242.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/lusubazezu.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wodage.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/nidipe.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bufimedekadidepez.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8d059598e48a0e0e875eb850612131e5/1986317930.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/64578808894.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc153489e9f---65671007317.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be7e152f4c6---gutijupe.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vujamifav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=coefficient+of+viscosity+experiment+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_off0000f38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38A 10888 bytes
SHA-256: caccbc7feeb7a35f540aa3d807b777a2bba01390fe6fd2a22ff8ece02c3a3c7b
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 19192 bytes
SHA-256: 97d543c1d5037fd2684a8e48c0eccfbe6bbd13b73e2cfb64ec9b063c504f7292
font_02_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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