Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4437c5a6fcf66f7…

MALICIOUS

PDF

88.7 KB Created: 2021-07-17 09:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9550e4bbdbefe61281051883b3652e60 SHA-1: ed164a5a964384c6dda45060d0aba75e34942f2b SHA-256: c4437c5a6fcf66f7569357f178b32a149580266d6a610d545c5c00e799aec91f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8d92db48e0b95029877147b6c46892fc/merotig.pdf In PDF document text
    • http://ecovn.vn/uploads/news_file/15268959973.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/40488973088.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/5c600a0243cc1773057fb90e1a5cadd0/14056819918.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210628070006.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/34903382097.pdfIn PDF document text
    • http://balone.net/_upload/file///wokukipanel.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/641c97c542919dc15f118a2d2c23cb2d/surofigo.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/21472514694.pdfIn PDF document text
    • http://alcantara.cz/data/file/31523192005.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210531042557146.pdfIn PDF document text
    • https://samtee.com/admin/images/file/zalekiboxibadopoderi.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/lemija.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gt8s648thiu3evbfmbtnhm16mo/58260548876.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/31579078909.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/t63vpqkinf9djtfg12tst9shp6/25884531219.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/i43ba14p79mt5ep22o7o180ls1/vazimarere.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed2a08f152---71831426467.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57lgil3amjukcvaudji2c0b0vl/zakosavizurigomin.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/bojamilerumisolapebigin.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768fc55d43c---jiwodisu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/78f918bb74993cb554590b8382c39ff2/zarawepamogobapumo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0356e4682---47210128491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=book+on+project+management+pdfPDF 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_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 17896 bytes
SHA-256: bb972452dd29ea67721ec05b2a00842c85b5ec3e75be5912b3ee0d040592dc41
font_02_sfnt_off00013c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 10932 bytes
SHA-256: 566ba30a0601ceef15033ed8024e4d610e802c3a82ed8f1d1bedb577ef1d6262

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