Malicious PDF — malware analysis report

Static analysis result for SHA-256 fae5016b2bb8eb31…

MALICIOUS

PDF

110.2 KB Created: 2021-09-03 10:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5289c4ba759dbf7b7c759ab2d32242ce SHA-1: 1344a8e9f5eccd927470b8aad9c1c3ab4d8c8bd1 SHA-256: fae5016b2bb8eb31ba86c2ea87e408dd5779f42b779fd7fdd0ca3b8b70185c5f
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=kenneth+grant+hecate%27s+fountain+pdf PDF link annotation
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/begun.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/31079530748.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///77685021885.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/suraxigufizunogaroluni.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/60397121287.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/28739910476.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/96897627937.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/65679115561.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0fg33l5ak9013mp8r1mag4s5e5/jusog.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84f80b563---lazunofuzurefimod.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/28034371771.pdfIn PDF document text
    • https://kueapem.com/contents//files/bawetoxud.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/kavovolufelonedikun.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/lizufonopojorefobi.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/zimogexegidafekoviguru.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f922ea583e---mobodizixuzodowug.pdfIn PDF document text
    • http://usmleworkout.com/files/file/ruvofofo.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/15043058761.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/98894548361.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/31e1b0c907a304fd3ccea44741758e26/fisegulekagubuxoxe.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/30110a8e0cd4b8eef115fa4226696aa8/gaserizuxajivitimedilebav.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/ffbbbf480aea52189864c68b9bb5604e/89785947069.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_off000145f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 10976 bytes
SHA-256: e6014d721cb0e2cb7eb64f7211f2e4e86cdabf83b4d3deac54b51da5e1655915
font_02_sfnt_off00017756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17756 19404 bytes
SHA-256: 3089335bcd6867049f55ce94ddcbf5313f2bff5aa8675f83865a77bc7b1be866

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