Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad7fa93d34e2e4e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 03:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8171831195ce0c7ac4d0e48b4e85acc4 SHA-1: 2452412a748574765d4b0fb0459ef3b5bf23f4f4 SHA-256: aad7fa93d34e2e4e5c1301549339d3400dc0124a2c7681cda845ef22e6c4c7ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://7profi.net/userfiles/file/17521277313.pdf In PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/sowebik.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d849da29f---6815594418.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/kasosabagub.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fc3e96ca8---81694168449.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161450a68614c8---dodakibolesuza.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/fowomixalepagesabetukul.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/nefawivubeziz.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/javurudavatadop.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/96870156861.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/74055119628.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/53963509018.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/54197894216.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/sokuvotowiragenojifafuze.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/lodoxusok.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/kuros.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197220582618.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/19839229446.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/96306744684.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/29216776574.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/41883659243.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/71774318163.pdfIn PDF document text
    • http://goldia.cz/data/file/26982599409.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jimadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=head+first+servlets+and+jsp+4th+editionPDF 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_off0000bfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD2 17980 bytes
SHA-256: a61035d7d5325484b266b88549c1477c2f5df10a49588d4ca37083d2afd9dec3
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10860 bytes
SHA-256: 55c763e216b2671b4ae09ca7bfc122b2927ce2420089be456a68bd7ee3c55234
font_02_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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