Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4403364fd6d3ca5…

MALICIOUS

PDF

89.6 KB Created: 2021-08-29 13:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 31d69c619337e28c3198b959f5f3bb11 SHA-1: 8e6d3a87a4600679c7f4d76e1fdab5c2b025b935 SHA-256: a4403364fd6d3ca5cf83ad84fd440265316c2a26639d927213bed93bcfe214ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories and disposable domains, a common tactic for distributing phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mengnuanua.com/app/webroot/files/files/zejevopogazovepomuguwo.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cf527b87b3d8a9618573dba0e1757079/53244378538.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/91336851665.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/6087571844.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d070e10e05db344365c4241f68549b7e/vufozukixi.pdfIn PDF document text
    • https://stopserv.ru/files/file/tajapuvopu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d6aa9b4d6---xerabopakivofo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/fumutotoxofefomulotevej.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee620a52d---50472600247.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/navixa.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/12615517.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/adr3ddmfo0c3dmubu3tqkouhos/jalibapolamadekinarum.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/def0f1f84470c62178b0501484029f6b/17019957902.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/fatusakevofovek.pdfIn PDF document text
    • http://altinay-law.com/images/file/51613287166.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/67bgt4ikkqunorjc4khqdlhsi1/67046031110.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/bagepuzike.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0efb874f---29007275572.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/zabaretokaximivovowivit.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/51728269210.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021060911365575.pdfIn PDF document text
    • http://billsky.ee/files/file/jedenekowekozudemukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=supportive+educative+nursing+system+examplesPDF 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_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 18496 bytes
SHA-256: 8bff86eceaf8663a9b9a71c4f88f6d2844895cb4d5706d93a2371b6feff8c5df
font_01_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 11312 bytes
SHA-256: 42adaaa740a868a39b89073a49b0489832dbf1f45a516d28df3905976f72a05f
font_02_sfnt_off000140d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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