Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c997688d763d1d…

MALICIOUS

PDF

71.2 KB Created: 2021-05-30 16:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54e207f7ae47f7ca857660c9d74b4d49 SHA-1: c1189e01115ade71521d4a5ecf49821329c78afd SHA-256: 43c997688d763d1d69e8210012de075f60b53d28743ab6bdb9c8805bf04c59cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://htddienstverlening.nl/userfiles/file/56453968273.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983693a4f46---92797161168.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3fb3a445b---81170685960.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b01e8bebd---rotopiretitixise.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef3aea4b8---dowuzofor.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/dogexajikinogozoradef.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/76678984205.pdf
    • http://aclamerica.com/customers/CMS-IMAGES/file/90049545763.pdf
    • http://royalwedding.jp/images/blog//file/98438425454.pdf
    • http://antifftech.com/uploadfile/file/%5C/2021051106534234.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ac77ee01---84129557701.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e44648cbe968d95f2756a399b2c51bd9/90792082781.pdf
    • http://softwarefactory.nl/images/file/2434295367.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87a5d0346---71330240747.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd3c98580---xexonojotutid.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/89fdabbed32b1cadcc2b76b6dfdded14/tedijare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ielts+writing+task+1+table+sample+answer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cec0.bin
e72359a2a20194a6c89608e15b8ba09c1d40c198c9b79e7ba4b0f1a391ae6c66		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 5424 bytes
font_01_sfnt_off0000e12d.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 1800 bytes
font_02_sfnt_off0000e9bb.bin
1acc34feeea5a7f659d29e2e81f9985806946fe95e8913534713225e67d5d8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 10464 bytes

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