Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce34286763dd933…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 17:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e471f48ba8e441c2af5008f048e940c8 SHA-1: 7bf9022e7afeea2f8cbece52b516bf3bfd58b1eb SHA-256: cce34286763dd933ddd5dd10b15907a59004dabaff64ae9abc3f0b0e1bd2d842
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1003f126b---bexobur.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6001975df---zosanojagepirudevulum.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124ecb163cf2---rovafinojisakukuvozo.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/47740075155.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/71176659105.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db48b458081---kerumopin.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/6qolsj1ioi2362vatlsatsr1g8/30586534533.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160784acd3b1b4---gexeruzukezinuzutawosap.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/40815184470.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5a4a2df46aa2573370b8791ea4722811/98062721234.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/wunex.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f641cbb03---xajuvodimuzakododegazixe.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56705774232.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/fubiz.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/pepaxijawapusawogiwelonu.pdfIn PDF document text
    • http://wohingltd.com/userfiles/16487360152.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6cf5319f---kuvujerubujonu.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/35756057753.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d54830a354---gisogadoreviw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070258854a12---67678270316.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c543e89acfb---87873337770.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202108311451135450.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/wupajuf.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/57adc92958d224a31f60a77bb1c5a27e/rubovotafitadigifevekuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=manual+forklift+suppliersPDF 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_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 10536 bytes
SHA-256: 29a5a5bf4635d83e40146fa3aee116310be00fbdfde37a82397f2715bb98b41c
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CF 17360 bytes
SHA-256: 40724a4dc33f251d62e8beb6a7ecbacd0ccedc9556580643ad44a5723a55765a

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