Malicious PDF — malware analysis report

Static analysis result for SHA-256 42dfaa440055f31d…

MALICIOUS

PDF

137.8 KB Created: 2021-07-05 18:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5320393ad464d2ed8d217ba10f58fb54 SHA-1: acb7ac11d47738737f5f6d0c35ab55cf54752e16 SHA-256: 42dfaa440055f31d69402a98b8c6552e6bac655788c7039798663cb508761b36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9226

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://oniceh.ru/uplcv?utm_term=meaning+of+meteorologist PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ac0e186f9---tomesonup.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/34552232613.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/54178620894.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/fc58a32d27aa0bb86e558067a0f1c445/benurexofavotemazaxodu.pdfIn PDF document text
    • https://zhansq.cn/upload/file/95610348251.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/ruwarapug.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087adf23d74a---gawuv.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607130ecae432---78922061206.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/uq339igsea615jubqmhthg9o7d/fanumifolowov.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/22690866490.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/d79d667f9al3dejn809b7a4uc0/wexorumasivise.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c87ceaf890b1772ddf2cf988eef8706f/masufiwezuxobuwetiwamuri.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d2d0f6c9---15912912768.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/luvoxupoxunefikafovoma.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ad8c4d2b1458502eb692375b29224667/fenabutapabogelosuluvobow.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae781d694e6---90854978294.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5297b6485a---sufisazof.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070768a857e3---bogizutixuboporeze.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/dq5mia7m0d2pmh5thg15h6f0ln/96041111392.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d33b47ff6---xuligid.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ca230c3a---wevesijivimowem.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/51844811049.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/bakaro.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A69 10548 bytes
SHA-256: 2fe222bebf77a47a8d1c52df2ce274e203e9a8b7f6ada13ba4f97b3a20fc8551
font_01_sfnt_off0001a268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A268 23084 bytes
SHA-256: 36791d44e464eb866d028d37df9bee08a8753d636e6887ee962758ff2caebba7
font_02_sfnt_off0001dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F431 2684 bytes
SHA-256: d135a63173801f6106f4706d3b7c4d2f2ee7bf14332ee340a20a99e8464d5b9a
font_04_sfnt_off0001ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF88 17196 bytes
SHA-256: 517979091f1d93eee5cf22e81a53817caeeb965373738a8a2074147e9113db3b