Malicious PDF — malware analysis report

Static analysis result for SHA-256 c358906f43e5d4ec…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 17:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2e24ed6b54f6fdaad52d2336a541589a SHA-1: 9fd4e18b87d2941d2d5927dfd6b263754a4c5ac6 SHA-256: c358906f43e5d4ec794e36c9980beaa426b178deee0ecdc29e44e8d28e15f4ec
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 WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abd2e147aca---55270123015.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca9f392ba---9660958439.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/bd9tbkbj35n90ig3c5sl08p86i/2546193049.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/89306131518.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/vitotewoxirumun.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941fd72c7a5---kupam.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/24726229982.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d272f5eab62---muvuxonit.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/d423da8d8f4ed8862eaf70262f3eddbb/98334612255.pdfIn PDF document text
    • http://poorclarescork.ie/images/kabinitiw.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6f39733b---kikiwi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/topetim.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/10923150051.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c27eb71b80c89bee0858efd80a9aa07e/74130229261.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/jelorufefazigune.pdfIn PDF document text
    • http://gibisch.org/files/files/97578275398.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3667243969.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/ditinipoxobotagodorekigul.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/ba47436cefddfbc3ca46da42b480be16/jivoripafala.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f5b9578e---39857941802.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/kitotagogojulot.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161885333.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/cn71t8sqjhnnq483vjl28ttmmq/33299148963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tekonsha+prodigy+p3+user+manualPDF 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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 11184 bytes
SHA-256: e44f91670ada64a87d21b490f4a5115e3efc38aeb66ba30ee1b446b98b08759a
font_01_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 17960 bytes
SHA-256: ce4552f7fb5f8844ee44f1094d54808949dcb5df04af4500233aa0b24f16e32e
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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