Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1f26ce4c964500…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 10:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb96809318202c373f16891fe74b1e23 SHA-1: f5cb42b80f14dccb9ee7fd0c7d1fbf8a916e168a SHA-256: 4c1f26ce4c964500fd0f904fc6fbd901c04807119f7f5fad055b36af118ae618
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads 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 distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://stpatswatertown.org/ckfinder/userfiles/files/44126350751.pdf In PDF document text
    • http://seosanhrd.com/userfiles/file/nojulezexedorumufusiji.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3e2c441e389c61d7b99ff025e1edc1b1/93741314165.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/45354030042.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160de982cde437---dokanu.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1afa6400---59490378076.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/eee63e5413c19f853b61ec5af942f735/70337781974.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/57013292887.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/nanon.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7epjc6jaruuibn4fgnfo6kqq15/xilijegifizozomatodan.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/7850837903.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/nudex.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a222411da4e---17959942112.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/41441635901.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8737b65922d190cfae365c3faa16fdce/41782864231.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/5895768809.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21b9ce645b---fofikobije.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/58534095778.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vineguwev.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/pamiwatotuvodele.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/nodimamobemikekuku.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/dekifegapufidosugomor.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/15056316428.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6lfk86vlkg3dq8c22mr376mklf/xewara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=plural+of+nouns+worksheets+for+grade+4PDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 10896 bytes
SHA-256: d2aa88ebbc6d0ba89a8d2a6cec439843cf39a152b3f1bda26dfdbc93c87d3ce9
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 17408 bytes
SHA-256: 53276b5c3ffaec5315276fa22aa8a78aa05f0d6eb03d311f00de2df6c8574393