Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f06a0085307cb0c…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 03:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6239dd389a740f791f90076a9e22945 SHA-1: 211b68f528c6cfa8e8a92d5c2a914deba52d456d SHA-256: 1f06a0085307cb0c0761e96f50473a0f84666ff20ff1339a53e916935bb0e7a8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5e8c863f1---56227445859.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb74efe86---zosurosotu.pdf
    • http://elcampoeco.org/FCKeditor/file/nujavunumopivovasus.pdf
    • http://nacyc.jp/Upload/file/246332952.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a0c1720294155bcca792d2308ec58c4f/rufusinulovoduv.pdf
    • http://solamsys.com/userData/board/file/marew.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/19usfr2ji26pu0fed8kbtkrkmm/nogus.pdf
    • https://jetaime-shop.com/files/zawajuzufetivajo.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b283efee372---9312391119.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f27f4a5e8d9cc9290adbd31b5090aa05/97627047431.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jjb6i4ij68upjb83btams939k6/wevilav.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34b3a39609---30140133546.pdf
    • http://booklandbooks.com/userfiles/file/68218357743.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/36238182054.pdf
    • http://msiutilities.biz/documents/79922694260.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512101915707953.pdf
    • https://erdemlerkoleji.com/resimler/files/kibixovaden.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/7ljh6c59f05bu5mca8odums486/60921045339.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad14a757e9c---90971328481.pdf
    • https://alnahamgroup.com/userfiles/file/8145410720.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/e64fe5de80f689bfb51faeeebeabcaac/91995715908.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/nt14agh0dlqletas2a0sl0nd97/wanotibibexire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=preparation+of+ketone+from+grignard+reagent
    • 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_off0000eaba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 16792 bytes
font_01_sfnt_off000102d1.bin
926751dc7b5a94b6ba72321055766f50be9f3637ef653f4d45a6279c23f47625
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 10720 bytes
font_02_sfnt_off00011b2f.bin
a54656cc837c42b1fc3c2136112c808d1653201f710227e3973b95e87e8be0b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2F 18468 bytes