Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f532e8a6062e3a…

MALICIOUS

PDF

76.2 KB Created: 2021-07-02 03:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 536cf540b1acf09ffa4a9b6b981f7034 SHA-1: ef74678dd1b7945b99fc62e7408c336b6ffea836 SHA-256: 34f532e8a6062e3adef1ef173bbd5d6d370c78d4ca0f21ccd50970f375982b68
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 upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated and does not provide direct textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ui3h84v7qo53p2d5i7h4he0ll4/53106820904.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872048cdada---fenasegoziganagoresap.pdf
    • http://hpworld.hu/data/pic/Image/file/soruwizel.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abc95b9f517---16320096571.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s0l63fss2g1g2cgu619t41r90h/95106032076.pdf
    • https://condicionamentofisico.com/arquivos/file/75816696327.pdf
    • http://chi-kara.net/userfiles/file/temanopozavureterusesik.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/337d0b6a8d632a71de0d066f756aeac1/8736024167.pdf
    • http://quick-thailand.com/images/uploads/file/jutuzoxiwarezot.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16081724a5dad3---batokenu.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d24314674---vujelixipokamawodomevunar.pdf
    • http://hataylezzeti.com/resimler/files/34641454768.pdf
    • http://harlit.com/ckfinder/userfiles/files/20210702_080815.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08cfd91ef---20327913298.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c73bdfbe---69363319738.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd78a7c4dba---91761050229.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a12655015---butaposinuzuselateko.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/105f3398ba8a7377edd7e19010df3c6c/14896476508.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b54337bd3---34298949991.pdf
    • http://myredm.ru/uploads/file/daliserik.pdf
    • https://vieclamday.com/userfiles/file/dawuxu.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae3862cf9---zilepufigidesoxujolazepiw.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/0043cb491665bd89dffd1a9bf8789e1a/19937490447.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e7164eaf4---gawasakafozobirasejob.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rrb6i7tm4it06qn6npu26j44b5/jupinufil.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/327eef02b4824ea219f1350a1c67b35c/18680622820.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=coby+mp620+4g+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 16792 bytes
font_01_sfnt_off0000dbfb.bin
e00a7564d28f503f02adff7bb641e5d5612c5c3d59163b690ff882099e534a1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10876 bytes
font_02_sfnt_off0000f4f6.bin
f5fcb3fea9e24157d183721b8d9bd93c1fc188d3fd02128f44dafdd47aa744e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 17192 bytes

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